Browse Surnames

This is a list of surnames in which the usage is Irish; and the first letter is O.

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Ó Baoghill Irish
Irish Gaelic form of Boyle.

O'Beirne Irish
Variant of O'Byrne.

O'Berne Irish
Variant of O'Byrne.

O'Boyle Irish
Variant of Boyle.

Ó Brádaigh Irish
Irish Gaelic form of Brady.

Ó Bradáin Irish
Irish Gaelic form of Braden.

Ó Braoin Irish
Irish Gaelic form of Breen.

Ó Braonáin Irish
Irish Gaelic form of Brennan.

Ó Briain Irish
Irish Gaelic form of O'Brien.

O'Brian Irish
Variant of O'Brien.

O'Brien Irish
From the Irish Ó Briain meaning "descendant of Brian".

Ó Broin Irish
Irish Gaelic form of O'Byrne.

Ó Buachalla Irish
Irish Gaelic form of Buckley 2.

O'Byrne Irish
Anglicized form of Irish Ó Broin meaning "descendant of Bran 1".

Ó Caiside Irish
Irish Gaelic form of Cassidy.

O'Callaghan Irish
Variant of Callahan.

Ó Caoimh Irish
Irish Gaelic form of Keefe.

Ó Caoimháin Irish
Irish Gaelic form of Cavan.

Ó Caoindealbháin Irish
Irish Gaelic form of Quinlan.

Ó Caolaidhe Irish
Irish Gaelic form of Keeley.

Ó Carra Irish
Means "descendant of Carra", Carra being a nickname meaning "spear".

Ó Catháin Irish
Means "descendant of Cathán".

Ó Cathaláin Irish
Irish Gaelic form of Callan.

Ó Cathasaigh Irish
Irish Gaelic form of Casey.

Ó Ceallacháin Irish
Irish Gaelic form of Callahan.

Ó Ceallaigh Irish
Irish Gaelic form of Kelly 1.

Ó Cearmada Irish
Irish Gaelic form of Carmody.

Ó Ceithearnaigh Irish
Irish Gaelic form of Kearney.

Ó Ciardha Irish
Irish Gaelic form of Carey.

Ó Cinnéidigh Irish
Irish Gaelic form of Kennedy.

Ó Cléirigh Irish
Means "descendant of the clerk" in Irish.

O'Clery Irish
Anglicized form of Ó Cléirigh.

Ó Cnáimhín Irish
Means "descendant of Cnámh", Cnámh being a nickname meaning "bone".

Ó Cochláin Irish
Means "descendant of Cochlán", where the given name Cochlán is derived from Irish cochal "cape" or "hood". This surname originated in County Cork, Ireland.

Ó Coigligh Irish
Irish Gaelic form of Quigley.

Ó Coileáin Irish
Means "descendant of Coileán" in Irish.

Ó Comhraidhe Irish
Means "descendant of Comhraidhe", in which the given name Comhraidhe is of unknown meaning.

Ó Conaill Irish
Irish Gaelic form of Connell.

Ó Conaire Irish
Irish Gaelic form of Conroy.

Ó Conchobhair Irish
Irish Gaelic form of O'Connor.

Ó Conghalaigh Irish
Irish Gaelic form of Connolly.

O'Connell Irish
Variant of Connell.

O'Connor Irish
From Irish Ó Conchobhair meaning "descendant of Conchobar".

Ó Corcráin Irish
Irish Gaelic form of Corcoran.

Ó Corra Irish
Means "descendant of Corra" in Irish. The given name Corra means "spear".

Ó Corraidhín Irish
Irish Gaelic form of Curran.

Ó Cruadhlaoich Irish
Irish Gaelic form of Crowley 1.

Ó Cuaig Irish
Irish Gaelic form of Quigg.

Ó Cuana Irish
Irish Gaelic form of Cooney.

Ó Cuidighthigh Irish
Means "descendant of Cuidightheach" in Irish.

Ó Cuilinn Irish
Means "descendant of Cuileann", Cuileann being a nickname meaning "holly".

Ó Cuinn Irish
Irish Gaelic form of Quinn.

Ó Cuinneagáin Irish
Irish Gaelic form of Cunningham 2.

Ó Cuirc Irish
Irish Gaelic form of Quirke.

Ó Dálaigh Irish
Irish Gaelic form of Daly.

Ó Damháin Irish
Means "descendant of Damhán".

Ó Deasmhumhnaigh Irish
Irish Gaelic form of Desmond.

Ó Deoradháin Irish
Irish Gaelic form of Doran.

Ó Díomasaigh Irish
Irish Gaelic form of Dempsey.

Ó Dochartaigh Irish
Irish Gaelic form of Doherty.

Ó Doibhilin Irish
Irish Gaelic form of Devlin.

Ó Doirnáin Irish
Irish Gaelic form of Durnin.

Ó Domhnaill Irish
Irish Gaelic form of O'Donnell.

Ó Donnchadha Irish
Irish Gaelic form of Donoghue.

Ó Donndubháin Irish
Irish Gaelic form of Donovan.

O'Donnell Irish
Anglicized form of Irish Ó Domhnaill meaning "descendant of Domhnall".

Ó Donnghaile Irish
Irish Gaelic form of Donnelly.

O'Doyle Irish
Variant of Doyle.

Ó Dubháin Irish
Irish Gaelic form of Duane.

Ó Dubhghaill Irish
Irish Gaelic form of Doyle.

Ó Dubhshláin Irish
Irish Gaelic form of Dolan.

Ó Dubhshláine Irish
Irish Gaelic form of Delaney 2.

Ó Dubhthaigh Irish
Irish Gaelic form of Duffy 1.

Ó Duibh Irish
Means "descendant of Dubh", Dubh being a byname meaning "dark".

Ó Fallamháin Irish
Irish Gaelic form of Fallon.

Ó Faoláin Irish
Irish Gaelic form of Whelan.

Ó Fearghail Irish
Irish Gaelic form of Farrell.

Ó Fionnagáin Irish
Irish Gaelic form of Finnegan.

Ó Fionnáin Irish
Irish Gaelic form of Fannon.

Ó Flannagáin Irish
Irish Gaelic form of Flanagan.

Ó Flannghaile Irish
Irish Gaelic form of Flannery.

Ó Floinn Irish
Irish Gaelic form of Flynn.

Ó Foghladha Irish
Irish Gaelic form of Foley.

Ó Frighil Irish
Irish Gaelic form of Friel.

Ó Gallchobhair Irish
Irish Gaelic form of Gallagher.

Ó Gormáin Irish
Irish Gaelic form of Gorman 2.

O'Gorman Irish
Variant of Gorman 2.

Ó Gráda Irish
Irish Gaelic form of Grady.

Ó hAllmhuráin Irish
Irish Gaelic form of Halloran.

O'Hanegan Irish
Variant of O'Hannagain.

O'Hanigan Irish
Variant of O'Hannigain.

O'Hannagain Irish
From Irish Ó hAnnagáin, which means "descendant of Annagán". The given name Annagán was a diminutive of Annadh meaning "delay".

Ó hAnnagáin Irish
Irish Gaelic form of O'Hannagain.

O'Hannagan Irish
Variant of O'Hannagain.

O'Hannegan Irish
Variant of O'Hannagain.

O'Hannigain Irish
Variant of O'Hannagain.

O'Hannigan Irish
Variant of O'Hannagain.

Ó hAodha Irish
Irish Gaelic form of Hayes 2.

Ó hAonghuis Irish
Irish Gaelic form of Hennessy.

O'Hara Irish
From the Irish Ó hEaghra, which means "descendant of Eaghra", Eaghra being a given name of uncertain origin. Supposedly, the founder of the clan was Eaghra, a 10th-century lord of Luighne. A famous fictional bearer of this surname is Scarlett O'Hara, a character in Margaret Mitchell's Gone With The Wind (1936).

Ó hEachthighearna Irish
Means "descendant of Echthigern" in Irish.

Ó hEaghra Irish
Irish Gaelic form of O'Hara.

O'Hearn Irish
Anglicized form of Ó hEachthighearna.

Ó hÉideáin Irish
Means "descendant of Éideán" in Irish. The given name Éideán is a diminutive of éideadh meaning "clothes, armour".

Ó hEidhin Irish
Irish Gaelic form of Hines.

Ó hÉidín Irish
Means "descendant of Éidín" in Irish. The given name Éidín is a diminutive of éideadh meaning "clothes, armour".

Ó hEidirsceóil Irish
Irish Gaelic form of Driscoll.

Ó hÍcidhe Irish
Irish Gaelic form of Hickey.

Ó hIfearnáin Irish
Irish Gaelic form of Heffernan.

Ó hÓgáin Irish
Irish Gaelic form of Hogan.

Ó hUiginn Irish
Irish Gaelic form of Higgins.

O'Kane Irish
Anglicized form of Ó Catháin.

O'Keefe Irish
Variant of Keefe.

Ó Laoghaire Irish
Irish Gaelic form of O'Leary.

Ó Leannáin Irish
Irish Gaelic form of Lennon.

O'Leary Irish
From Irish Ó Laoghaire meaning "descendant of Laoghaire".

Ó Loingsigh Irish
Irish Gaelic form of Lynch.

Ó Luain Irish
Irish Gaelic form of Lane 3.

Ó Madaidhín Irish
Means "descendant of Madaihín", a given name derived from Irish madadh meaning "dog, mastiff".

Ó Máille Irish
Means "descendant of a nobleman" from the Irish Gaelic mál.

Ó Mainnín Irish
Irish Gaelic form of Manning 2.

O'Malley Irish
Anglicized form of Ó Máille.

Ó Manacháin Irish
Irish Gaelic form of Monahan.

Ó Maoil Eoin Irish
Irish Gaelic form of Malone.

Ó Maoil Riain Irish
Means "descendant of a follower of Rian", derived from Irish maol meaning "follower".

Ó Maoilsheachlainn Irish
Means "descendant of Maolsheachlann" in Irish.

Ó Maolagáin Irish
Irish Gaelic form of Milligan.

Ó Maoláin Irish
Irish Gaelic form of Mullen.

Ó Maol Aodha Irish
Means "descendant of a follower of Saint Aodh". It is derived from Irish maol meaning "follower, servant".

Ó Maol Bhréanáin Irish
Means "descendant of a follower of Saint Brendan" in Irish.

Ó Maol Dhomhnaigh Irish
Irish Gaelic form of Moloney.

Ó Maolmhuaidh Irish
Means "descendant of Maolmhuadh", Maolmhuadh being a given name meaning "proud chief", derived from Gaelic maol meaning "chief" and muadh meaning "proud, noble".

Ó Maonaigh Irish
Irish Gaelic form of O'Mooney.

Ó Marcaigh Irish
Irish Gaelic form of Markey.

Ó Mathghamhna Irish
Irish Gaelic form of Mahoney.

Ó Meadhra Irish
Means "descendant of Meadhra". The given name Meadhra is derived from the Gaelic meadhar meaning "merry, happy".

Ó Meara Irish
Variant of Ó Meadhra.

Ó Mocháin Irish
Irish Gaelic form of Mohan.

O'Mooney Irish
From the Irish Ó Maonaigh meaning "descendant of Maonaigh". The given name Maonaigh means "wealthy".

Ó Móráin Irish
Irish Gaelic form of Moran.

Ó Muircheartach Irish
Irish Gaelic form of Moriarty.

Ó Muireadhaigh Irish
Irish Gaelic form of Murray 2.

Ó Murchadha Irish
Irish Gaelic form of Murphy.

O'Neal Irish
From Irish Ó Néill meaning "descendant of Neil".

O'Neill Irish
Variant of O'Neal.

Ó Néill Irish
Irish Gaelic form of O'Neal.

O'Niall Irish
Variant of O'Neal.

Ó Nualláin Irish
Irish Gaelic form of Nolan.

Ó Proinntigh Irish
Irish Gaelic form of Prunty.

Ó Rabhartaigh Irish
Irish Gaelic form of Rafferty.

Ó Raghailligh Irish
Means "descendant of Raghailligh", an Irish given name of unknown meaning.

O'Reilly Irish
Anglicized form of Ó Raghailligh.

Ó Riagáin Irish
Irish Gaelic form of Reagan.

Ó Riain Irish
Means "descendant of Rian".

Ó Rinn Irish
Means "descendant of Rinn". The given name Rinn means "star" in Irish.

Ó Ríoghbhárdáin Irish
Irish Gaelic form of Riordan.

Orman Irish
Anglicized form of Ó Ruaidh.

Ormond Irish
Anglicized form of Ó Ruaidh.

Ormonde Irish
Anglicized form of Ó Ruaidh.

Ó Rodagh Irish
Means "descendant of Rodach" in Irish. The given name Rodach is derived from from Irish rod meaning "spirited, furious".

Ó Ruadháin Irish
Means "descendant of Ruadhán" in Irish.

Ó Ruaidh Irish
Means "descendant of Ruadh" in Irish.

Ó Scolaidhe Irish
Means "descendant of the scholar" from Irish scholaidhe.

Ó Seachnasaigh Irish
Means "descendant of Seachnasach". The given name Seachnasach possibly means "elusive" in Irish.

Ó Séaghdha Irish
Means "descendant of Séaghdha".

Ó Seanáin Irish
Irish Gaelic form of Shannon.

Ó Seighin Irish
Means "descendant of Seighin". The given name Seighin means "small hawk" from Old Irish séigene.

O'Shaughnessy Irish
Anglicized form of Ó Seachnasaigh.

O'Shea Irish
Anglicized form of Ó Séaghdha.

Ó Síoda Irish
Means "descendant of Síoda", a byname meaning "silk" in Irish.

Ó Sirideáin Irish
Irish Gaelic form of Sheridan.

Ó Sluaghadháin Irish
Irish Gaelic form of Sloan.

Ó Suaird Irish
Means "descendant of Suart" in Irish. Suart is derived from the Old Norse name Sigurd.

Ó Súileabháin Irish
Irish Gaelic form of Sullivan.

O'Sullivan Irish
Variant of Sullivan.

Ó Tadhgáin Irish (Rare)
Irish Gaelic form of Teagan.

Ó Taidhg Irish
Irish Gaelic form of Teague 1.

Ó Téacháin Irish
Irish Gaelic form of Teahan.

Ó Tíghearnaigh Irish
Irish Gaelic form of Tierney.

O'Toole Irish
Anglicized form of Irish Ó Tuathail meaning "descendant of Túathal".

Ó Treasaigh Irish
Irish Gaelic form of Tracey 2.

Ó Tuathail Irish
Irish Gaelic form of O'Toole.

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