| O Boey | The origin and meaning of the surname O Boey is not clearly defined. It's possible that it could be of Irish origin due to the prefix "O" which is commonly found in Irish surnames and signifies... |
| O Bowe | The surname O Bowe is of Irish origin, derived from Gaelic "O buadhaigh" which means victorious. The initial "O" signifies "descendant of," representing a common early method of denoting familial... |
| Ó Canainn | Ó Canainn (anglicised as O'Kennan) is an Irish surname originating from the Gaelic word ‘ceann,’ meaning ‘head’ or ‘leader.’ The family were originally members of the powerful Uí Néill dynasty who... |
| O Carroll | The surname O'Carroll is of Irish origin and has Gaelic roots, derived from the Gaelic name "O'Cearbhaill," which means "descendant of Cearbhal." The term "Cearbhal" itself is believed to mean... |
| O Conaill | The last name O Conaill is an Irish surname, originating in County Donegal. It is an anglicised form of the Gaelic name Ó Conghalaigh or Ua Conghaile, signifying ‘son of Conghalach’. Conghalach is a... |
| Ó Conchobhair | The last name Ó Conchobhair is derived from the Irish language and was historically used to identify a person who was a descendant of the Connachta, an ancient Gaelic people who held the title of... |
| Ó Cuin | The last name Ó Cuin has Irish origins, derived from the phrase Ó Cúinne, which translates as “little hound”. This specific Irish clan is part of the larger Ui Fiachrach dynasty, which had an ancient... |
| Ó Cuinn | The last name Ó Cuinn is derived from a Gaelic surname which is a patronymic form (a name derived from the father's given name) of the Celtic personal name Conn. Conn is a name of great antiquity... |
| Ó Daimhín | The Irish surname Ó Daimhín (pronounced “oh DAY-veen”) derives from both the Gaelic ó Daimín, which means “grandson of Damhín”, and the Old Irish daimim, which means “venom”. In some cases, the Ó... |
| Ó Dálaigh | The Irish surname Ó Dálaigh (anglicized as O'Daly or O'Daley) is derived from the Irish Gaelic word ó Dhálaigh, meaning “descendant of Dálach”. The name Dálach is thought to have originated from a... |
| O Daly | The last name O Daly is an Irish surname originating from a Gaelic Clan name. The spelling for the name varies between O Daly, O'Daly, Daly, and Dayley.
The name originates from the 11th century... |
| Ó Dómhnaill | Ó Dómhnaill is an Irish Gaelic surname meaning "son of Domhnall." The name Domhnall is derived from the Irish Gaelic domno, meaning "world," and the Old Irish gal, meaning "valor." It is derived from... |
| Ó Donnchadha | The last name Ó Donnchadha is an Irish name associated with Gaelic culture. This surname has a long history, dating back to the 10th century. It is derived from the Gaelic phrase "Ó Donnchadha",... |
| Ó Dubhdara | The last name Ó Dubhdara is an Irish name originating in County Clare. This name is made up of two Gaelic words, 'Ó' meaning grandson of or descendant of, and 'Dubhdara', meaning a dark oak tree.... |
| Ó Duibhín | The last name Ó Duibhín is an Irish name which means "descendant of Duibhín". In the Irish language, the prefix "Ó" is used to denote a descendant of that particular surname, and the name Duibhín... |
| Ó Duibhir | The surname Ó Duibhir is an Irish surname of Gaelic origin. It is derived from the original surname Dubhghir, which means "dark one." The personal name Dubhghir was used in medieval Ireland as a... |
| O Duire | O Duire is an Irish surname that originates from the Gaelic "Ó Duibhdíre," which translates to "descendant of Duibhdíre." The personal name Duibhdíre is a compound of the elements "dubh," meaning... |
| O Duvire | O’Duvire is an Irish surname originating from the Irish Ó Duibhir, meaning “descendant of Duibhir”. The Gaelic name Duibhir is an ancient provided name which means “black-haired”. The O’Duibhir, or... |
| Ó Feore | The last name Ó Feore is an Anglicized version of the Irish Ó Fiaich, which is derived from the personal name Fiaich, a diminutive of Fia, which means "wolf". This surname is associated with County... |
| O Flanagan | The surname O'Flanagan is of Irish origin and derives from the Gaelic Ó Flannagáin, which means 'descendant of Flannagán.' The prefix "O" usually indicates "grandson of" or "descendant of," while the... |
| Ó Fuere | The last name Ó Fuere is derived from the Irish Gaelic O'Fuarain, the latter derived from the word "fuar," which means "cold." It is believed that the name was first used referring to a family that... |
| Ó Furey | The Irish surname Ó Furey translates directly as “descendant of Furey” and is derived from the Old Irish Gaelic name O’Fuaradh, which means “warm-hearted.” The Ó Furey clan originally originated in... |
| Ó Fury | The last name Ó Fury is an Irish surname. It is based on the Gaelic surname O Fuaraidh, which may refer to a number of related families. It was originally given to people from the village of Fuaraidh... |
| O Gara | The surname "O'Gara" is of Irish origin, specifically from the Gaelic "Ó Gadhra." The prefix "Ó" means "grandson of" or "descendant of," indicating a kinship or family line. The term "Gadhra" is... |
| O Guiney | The last name O Guiney is of Irish origin, and it is derived from the original ancient Gaelic name of "Ó Guinnigh." This Gaelic name, which is the equivalent of the name "Smith," originated from the... |
| O Guinidhe | The last name O Guinidhe is derived from the Irish Gaelic “O” prefix meaning “grandson of” or “descendant of.” The second part of the name “Guinidhe” is a variation of “Guinide” which translates to... |
| O Guinye | O Guinye is a surname of Irish and Welsh origin. It is an Anglicized form of the Gaelic name Ó Guine or Ó Guinn. The name is derived from the word "guine," which means "tradition" or... |
| O Hanlon | The last name O'Hanlon is of Irish origin and is derived from the Gaelic name 'Ó hAnluain', which translates to 'descendant of Anluan'. The name Anluan itself means 'great champion' or 'warrior'. The... |
| Ó HANNÁIN | The Irish Gaelic surname, Ó HANNÁIN, is derived from the forename Hannán. This moniker, which has been Anglicized to Hanney, Hanneyne, and Hanning, among other forms and variants, translates to... |
| O Hart | The last name "O Hart" is of Irish origin and is derived from the Gaelic name "Ó hAirt", meaning "descendant of Art." The name "Art" itself is derived from an old Celtic word that translates to... |
| O Haughlin | The last name O'Haughlin is an Irish surname, originating from the Gaelic phrase, "O'hUallachain", which translates to "descendant of Uallachain". This surname was traditionally bestowed upon members... |
| Ó hEignigh | The last name Ó hEignigh originates from the Irish language meaning “grandson of (Eignigh)”. The surname is derived from the given name “Eignigh” which is a combination of two words, éigse and ceann,... |
| Ó hOireachtaigh | The last name Ó hOireachtaigh is a typical Irish surname, meaning "descendant of the chief," or "descendant of the presiding officer." This surname is found in all four provinces of Ireland, but... |
| Ó hUallacháin | The surname Ó hUallacháin is an ancient Gaelic Irish name, derived from the Irish words ‘Ó’, meaning ‘grandson’, and ‘Uallachán’, meaning ‘valiant’. This surname is found mainly in County Cork and... |
| Ó hUigín | The last name Ó hUigín (anglicized as O'Higgins) is a common surname in Irish Gaelic. The name in Gaelic translates literally to "grandson of Uigin," Uigin being a personal name. Uigin is thought to... |
| Ó hUilín | The Irish surname Ó hUilín is derived from the personal name Uílín, which in turn was derived from the word for "helmet" (cilín). It is quite an uncommon name, which is found mainly in the province... |
| O Kelly | The last name O'Kelly is of Irish origin and is derived from the Gaelic name Ó Ceallaigh. The "Ó" prefix indicates "grandson of" or "descendent of", while "Ceallaigh" refers to someone who is brave... |
| O Loghan | The last name O Loghan is an ancient Irish surname which is derived from the Gaelic Ó Lócháin, meaning "descendant of Lóchán". The Gaelic word Lóchán refers to a dark-haired person. Lóchán was also... |
| O Longaigh | The surname O'Longaigh is an Irish one, believed to be of either Connacht or Munster origin. Its root goes back to the ancient Gaelic name "O'Leannachain", which roughly translates to "descendant of... |
| Ó Longáin | The last name Ó Longáin is derived from the Irish word 'Luan', which is translated to mean 'bright warrior', 'hero', or 'light'. The name is particularly associated with the Connacht province of... |
| Ó Maolchatha | The surname Ó Maolchatha is a patronymic surname derived from the Irish Gaelic personal name “Maolchatha”. Maolchatha is an old Gaelic name given to boys meaning “devotee of Saint Cathach.” It is... |
| Ó Maolruanaidh | The surname Ó Maolruanaidh (O'Mulrooney) is an Irish surname derived from two Gaelic words, “maol” meaning “bald” and “ruanaidh” meaning “champion”. Thus, this surname is translated to mean “the... |
| Ó Quin | The last name Ó Quin is a Gaelic surname, originating in Ireland. It is an Anglicization of the Irish and Scottish Gaelic Ó Cuinn meaning “descendant of Conn”. Conn is an Old Irish name which means... |
| Ó Quinn | The surname Ó Quinn is an Irish surname; 'O' is typically the Irish prefix signifying 'descendant of'. It is a patronymic surname, meaning it was originally derived from the given name of a direct... |
| ó Ráighne | The Irish surname Ó Ráighne, usually Anglicised as Riordan, O'Reardon, or O'Riordan, is derived from the Gaelic personal name "Raghnall" meaning "strong rule". It is believed to be an ancient Irish... |
| Ó Ríordáin | The Irish surname Ó Ríordáin (anglicised as O'Riordan) is derived from the Gaelic Ó Ruairidh, meaning "descendant of Ruairidh". Ruairidh or Raghallach was a personal name of the 10th century King of... |
| Ó Treasaigh | The last name Ó Treasaigh is an Irish surname derived from the Irish language phrase ó Threasach, which translates to "descendant of Treasach". Treasach is an ancient name likely meaning "of great... |
| O.h.l | The last name O.H.L is of German-Saxon origin. The letters O.H.L in the name stand for 'Ost Hessen/Lahn', which refers to the German state of Hesse, and the Lahn river which flows through it.
The... |
| O' Devine | The last name O'Devine is an Anglicised form of the Irish surname Ó Díomasaigh. The Ó Díomasaigh sept were members of the Uí Briúin Seóla, located in Galway and Roscommon. The last name is derived... |
| O'Beagain | The surname O'Beagain is an anglicised version of the Irish patronymic name Ó Baogáin, which is derived from the Irish Gaelic word 'baodh', meaning 'bond' or 'slavery'. This indicates that the... |
| O'Beirne | The last name O'Beirne is a surname of Irish origin which is derived from the Gaelic name "Ó Bearain/Ó Bearáin." This name was first used as a surname by descendants of a powerful family of... |
| O'Berry | The last name O'Berry is an Irish surname that has long been associated with the ancient Irish clans and families of the Northern Uí Néill. It originates from the Gaelic Ó Beargháin and denotes a... |
| O'Bigin | The last name O'Bigin is of Irish origin and is an Anglicized form of the traditional Irish surname O'Bhigín or 'grandson of the small one'. This surname was derived from the Irish word 'beag' which... |
| O'Bodyford | The surname O'Bodyford originates from the pre-Norman times of 11th century Ireland. The word “body” may refer to the Gaelic term “bodach” which means “ox,” suggesting an early occupation of the... |
| O'Bogue | The last name O'Bogue is an anglicized form of the Irish name ‘O’Bhogachain', which translates to the Gaelic ‘Grandson of the Boatman’. This name likely originates from the era of Irish and Welsh... |
| O'Boylan | O'Boylan is an Irish surname of Gaelic origin. It is derived from the Old Welsh personal name "Boylan," which refers to a dweller in a yellow-colored house. This name may also have a connection to... |
| O'Boyle | The last name O'Boyle is an Irish surname of Gaelic origin derived from the O' Baoighill clan. It is most commonly found in Northern Ireland, with some examples in the United States and Canada. It is... |
| O'Boylen | The origin of the surname O’Boylen is uncertain, though its use as a surname in Ireland dates back centuries. Some sources suggest it may have evolved from O’Boilin, an Old Irish surname, itself an... |
| O'Brassil | The last name O'Brassil is an Irish heritage family name of Gaelic origin. The O prefix is the Gaelic way of indicating the grandson of, or a descendant of, a particular man. In this case, the man... |
| O'Brian | The last name O'Brian is an Irish surname that originates from the Gaelic language. It is derived from the Old Gaelic phrase “O Briain” meaning “descendant of Brian”. The name Brian itself is derived... |
| O'Brien | The last name O'Brien is an old Irish surname originating in the Gaelic name Ó Briain, which literally translates to “descendant of Brian.” According to family historians and genealogists, the clans... |
| O'Brien/Bryan/Bryant | The surname O'Brien, Bryan, and Bryant are all derived from the ancient Irish name O'Brien meaning descendant of Brian. This surname is believed to have been derived from the surname Brion, which... |
| O'Bryan | The last name O'Bryan is an Anglicized form of the Irish surname Ó Briain, meaning "descendant of Brian." The Irish surname is derived from the old Gaelic name "Briain," which means "strong,... |
| O'Bryant | The last name O'Bryant is derived from the Irish surname Ó Brionntaigh, which means "descendant of Brionntach". It is thought to be derived from the Gaelic word ‘brionn’ which means "a royal figure... |
| O'Bryen | The surname O'Bryen is an ancient Irish surname believed to have derived from the Gaelic O’Braonain, which means “descendant of Braonain.” Braonain was a personal name believed to mean “descendant of... |
| O'Byrne | The last name O'Byrne is an Anglicized version of the Irish surname Ó Broin, which is derived from the Gaelic personal name Bran, meaning "raven". This origin dates back to a legendary group of... |
| O'Cain | The surname O’Cain is an Irish surname derived from the Gaelic words “O” meaning “descendant of” and “Cain” likely referring to a personal name, likely Cian, which derives from the Latin “Caius”... |
| O'Cairn | The last name O'Cairn is of Irish origin. It was taken on by people who lived in or near cairns (ancient man-made piles of stones used as landmarks). It is believed that the name signifies a person... |
| O'Callaghan | The surname O'Callaghan is derived from the first name Callaghan, which is an Irish form of the ancient Gaelic name Cailech. The Gaelic translation of this name is “brave in battle”, although some... |
| O'Cannifree | The surname O'Cannifree is rooted in Irish culture and is derived from the Gaelic “Ó Ceanndubhfrith,” which means “descendant of Ceanndubhfhridh.” This surname was most commonly used throughout... |
| O'Canning | The last name O'Canning is a surname originating from Ireland, with its roots being found in the Irish language. The surname is derived from the ancient Gaelic personal name 'Ó Cannain', and as such... |
| O'Cannon | The last name O'Cannon is an Irish origin surname taken from the Gaelic form of the name, which is O Ceanainn or O Coinneain. It is thought to have derived from the personal name Cenann, which means... |
| O'Carolan | The last name O’Carolan is an Irish surname of Gaelic origin, derived from the phrase ‘O’ Cathmhaoil’ where ‘O’ signifies ‘son of’ and ‘Cathmhaoil’ is a personal name derived from the words cath... |
| O'Carriel | The surname O'Carriel originated from the ancient Irish Gaelic name O'Cathmhuirail, which is composed of two distinct words - “O’,” a particle used to denote “son of,” and "Cathmhuirail,” which... |
| O'Carrol | The O’Carrol surname is an Irish patronymic name derived from the pre-10th century Old Gaelic name “O’Carthalain,” itself of uncertain origin. It was anglicized as O’Carroll, and may have originated... |
| O'Carroll | The last name O'Carroll is an Irish surname and is generally associated with the province of Munster. It is an ancient Gaelic surname, originating from Ui Cearbhaill, a native Irish dynasty located... |
| O'Cartan | The last name O'Cartan is a form of the Irish surname Ó Catáin or MacCatáin. The origin of the name is uncertain, though there is speculation that it may trace back to the Old Irish personal name... |
| O'Ciarnain | The last name O'Ciarnain is an Irish surname, originating in the Gaelic Ó Ciardhnaín, which translates to 'descendant of Ciardhnaín'. The Gaelic form is found predominantly in County Galway, Ireland,... |
| O'Cohalane/O'Coughlan | The surname O'Cohalane/O'Coughlan (also spelled as Coughlan, Coughlin, Coghlan, Coglan, O'Cullane, and Cohalan) is an Anglicized form of the Irish name Ó Comhghalláin, which translates to mean... |
| O'Coigley | The last name O'Coigley is an old Irish surname derived from the Gaelic surname Ó Cogaigh, where 'cogaigh' translates to 'helmet'. This name is believed to originate from when the O'Coigley family... |
| O'Coigligh | The surname O'Coigligh (Cogley in English) originates from the Irish Ó Coigligh, which is derived from the Celtic meaning "descendant of Coigleach", which is a name composed of two elements; "coig",... |
| O'Coilean | The last name O'Coilean is derived from the Old Irish Ua Cúileáin, meaning 'descendant of Cúileán'. Cúileán is a Gaelic term derived from 'cúilíneach', meaning 'cub, whelp, pup'. It is believed that... |
| O'Coilen | The surname O'Coilen is Irish in origin, derived from the Gaelic name O'Coilleain. It is an anglicized version of the native Irish sept of Coilleano, which means "descendants of Coillean". The sept... |
| O'Coinne | The last name O'Coinne is derived from the Irish Gaelic name O'Cionna, which was derived from the word cion, meaning "respectful love" or "beloved one". The prefix O' signifies "grandson of" or... |
| O'Coltaran | The surname O’Coltaran is an Irish surname derived from the Gaelic name O’Coltarain. The literal translation of the name is 'descendant of Coltarain'. Coltarain was a personal name which is derived... |
| O'Conaire | The surname O'Conaire is an Irish surname derived from the Gaelic O Conaire. The prefix “O” indicates the surname is a descendant of the ancient Celtic warrior Queen Maeve. The root of this surname... |
| O'Connell | The last name O'Connell (sometimes spelled O'Connel, O'Conneal, Connell, and Connel) is an Irish surname derived from the Gaelic name O' Conaill, meaning as “son of Conall”. Conall is a personal name... |
| O'Connelly | The surname O'Connelly is an anglicized form of the Irish-Gaelic name O'Conghaile. The Gaelic prefix "O" means "descendant of," while the root "conghaile" is derived from the ancient personal name... |
| O'Conner | The surname O'Conner is an Irish surname derived from the Gaelic Ó Conchobhair, which means "son of Conchobar". Conchobar, in turn, means “lover of hounds”, and was often used as a personal name in... |
| O'Connolly | The Irish surname O'Connolly is derived from the Gaelic name 'O'Conghaile', meaning 'descendant of Conghalach'. This is a personal name composed from the Gaelic elements 'conn', meaning 'chief' or... |
| O'Connor | The last name O'Connor is of Irish origin, and it is an Anglicized form of the Gaelic name 'O Conchobhair'. It means 'male descendant of Conchobhair', with Conchobhair being an old personal name... |
| O'Conor | The last name O'Connor (or O'Conor) is an anglicized version of the Irish surname "Ó Conchobhair," derived from the Gaelic words “con" meaning "hound," and "chobhar" meaning "desiring." This suggests... |
| O'Conraoi | The last name O’Conraoi (also known as O’Conroy, O’Conraghy, Conrauy, and Conroy) is a very ancient Irish surname, originally associated with the ancient Irish kingdom of Connacht. The name is of old... |
| O'Cooney | The last name O'Cooney is an anglicized version of the Irish name Ó Cuanaigh which is derived from the Gaelic word cúana, meaning "a wolf." The Ó Cuanaighs were an ancient sept of the Uí Fiachrach... |
| O'Corrigain | The last name 'O’Corrigain' is an Irish name, derived from the Gaelic name 'Ó Corragáin'. The prefix 'Ó' denotes 'descent from', and 'Corragáin' is a patronymic based on the Gaelic given name... |
| O'Corry | The surname O'Corry is an Irish surname, derived from the old Gaelic name O'Corraidh. It is found mainly in County Cork, but is also present in other parts of Ireland and in other countries. The... |
| O'Cosgras | The Irish surname O’Cosgras (sometimes spelled O’Cosgrave) is derived from the Gaelic word “cosgar” which translates as “victorious”. It is an anglicized version of the original Irish name... |
| O'Cremin | The last name O'Cremin is derived from the Irish surname O'Créamhain. The most likely origin of the name is that it is derived from the Gaelic word ‘créamh’ which roughly translates to ‘victor’.... |
| O'Cronin | The last name O'Cronin is a surname of Irish origin, coming from the ancient Gaelic name “O’ Cronain”. The name is derived from the old Gaelic term “cron” which translates to “violent” or “warlike”.... |
| O'Crotty | The surname O'Crotty is an Irish surname stemming from the Gaelic name "O'Crotaigh" which means "descendant of Crotar" or "descendant of a hound". O’Crotty is an anglicised version of the name that... |