Old Irish Origin Surnames

This is a list of surnames in which the origin is Old Irish. Old Irish was the form of the Irish language spoken up to the 10th century.
usage
origin
Ahearn Irish
Anglicized form of Ó hEachthighearna.
Ahearne Irish
Anglicized form of Ó hEachthighearna.
Angus Irish, Scottish
From the given name Aonghus.
Beirne Irish
Variant of O'Byrne.
Berne Irish
Variant of O'Byrne.
Blain Scottish
From the given name Bláán.
Blaine Scottish
From the given name Bláán.
Brannon Irish
Variant of Brennan.
Breen Irish
Anglicized form of Irish Ó Braoin meaning "descendant of Braon", a byname meaning "rain, moisture, drop".
Brennan Irish
From Irish Ó Braonáin meaning "descendant of Braonán", a byname meaning "rain, moisture, drop" (with a diminutive suffix).
Bryan English
From the given name Brian.
Bryant English
From the given name Brian.
Burns 2 Irish
Variant of O'Byrne.
Byrne Irish
Variant of O'Byrne.
Byrnes Irish
Variant of O'Byrne.
Callahan Irish
Anglicized form of Irish Ó Ceallacháin meaning "descendant of Cellachán".
Callan Irish
Anglicized form of Irish Ó Cathaláin meaning "descendant of Cathalán".
Caomhánach Irish
Irish Gaelic form of Kavanagh.
Carey Irish
Anglicized form of Irish Ó Ciardha meaning "descendant of Ciardha".
Carroll Irish
From the given name Cearbhall. A famous bearer was Lewis Carroll (1832-1898), whose real name was Charles Lutwidge Dodgson, the author of Alice's Adventures in Wonderland.
Cary Irish
Variant of Carey.
Casey Irish
Anglicized form of Irish Ó Cathasaigh meaning "descendant of Cathassach".
Cavan Irish
Anglicized form of the Irish Ó Caoimháin meaning "descendant of Caomhán".
Collins 1 Irish
Anglicized form of Ó Coileáin. A famous bearer was Michael Collins, an Irish nationalist leader who was assassinated in 1922.
Connell Irish
Anglicized form of Irish Ó Conaill meaning "descendant of Conall".
Connor Irish
Variant of O'Connor.
Cullen 2 Irish
Anglicized form of Ó Coileáin or Ó Cuilinn.
Cummins English, Scottish, Irish
From the Old Breton given name Cunmin, a cognate of Cuimín, introduced to Britain at the time of the Norman Conquest.
Cunningham 2 Irish
From Irish Ó Cuinneagáin meaning "descendant of Cuinneagán", a diminutive of Conn.
Daley Irish
Variant of Daly.
Daly Irish
Anglicized form of Irish Ó Dálaigh meaning "descendant of Dálach".
Davin Irish
Variant of Devin 1.
Delaney 2 Irish
Anglicized form of Irish Ó Dubhshláine meaning "descendant of Dubhshláine".
Desmond Irish
Anglicized form of Irish Ó Deasmhumhnaigh meaning "descendant of the man from South Munster", originally indicating a person who came from the region of South Munster (Desmond) in Ireland.
Devin 1 Irish
Anglicized form of the Irish surnames Ó Damháin or Ó Dubháin.
Dolan Irish
From the Irish Ó Dubhshláin meaning "descendant of Dubhshláine".
Donalds English
Derived from the given name Donald.
Donaldson English
Means "son of Donald". A notable bearer is the online personality Jimmy Donaldson (1998-), who goes by the alias MrBeast.
Donne Scottish, Irish
From Gaelic donn meaning "brown", a nickname for a person with brown hair.
Donoghue Irish
From Irish Ó Donnchadha meaning "descendant of Donnchadh".
Donovan Irish
Anglicized form of the Irish name Ó Donndubháin meaning "descendant of Donndubán".
Douglas Scottish
From the name of a town in Lanarkshire, itself named after a tributary of the River Clyde called the Douglas Water, derived from Gaelic dubh "dark" and glais "water, river" (an archaic word related to glas "grey, green"). This was a Scottish Lowland clan, the leaders of which were powerful earls in the medieval period.
Doyle Irish
From the Irish Ó Dubhghaill, which means "descendant of Dubhghall". A famous bearer was Arthur Conan Doyle (1859-1930), the author of the Sherlock Holmes mystery stories.
Duane Irish
Anglicized form of Irish Ó Dubháin meaning "descendant of Dubhán".
Duff Scottish, Irish
Anglicized form of Mac Dhuibh or Ó Duibh.
Duffy 1 Irish
Derived from Irish Ó Dubhthaigh meaning "descendant of Dubthach". Their original homeland was Monaghan where the surname is still the most common; they are also from Donegal and Roscommon.
Duncan Scottish
From the given name Duncan.
Duncanson Scottish
Means "son of Duncan".
Dunn English, Scottish, Irish
Derived from Old English dunn "dark" or Gaelic donn "brown", referring to hair colour or complexion.
Ennis Irish
Variant of Innes 1.
Fannon Irish
From the Irish Ó Fionnáin meaning "descendant of Fionn".
Farrell Irish
Anglicized form of Irish Ó Fearghail meaning "descendant of Fearghal".
Ferguson Irish, Scottish
Means "son of Fergus".
Findlay Scottish
Anglicized form of MacFhionnlaigh.
Finlay Scottish
Anglicized form of MacFhionnlaigh.
Finley Scottish
Anglicized (typically American) form of MacFhionnlaigh.
Finn Irish
Derived from the given name Fionn.
Finnegan Irish
Anglicized form of Irish Ó Fionnagáin meaning "descendant of Fionnagán". The given name Fionnagán is a diminutive of Fionn.
Finnin Irish
Diminutive form of Finn.
Flanagan Irish
From Irish Ó Flannagáin meaning "descendant of Flannagán". Flannagán is a given name meaning "blood red". From County Roscommon in Ireland, it has many other spellings.
Flynn Irish
Anglicized form of Irish Ó Floinn meaning "descendant of Flann".
Friel Irish
From the Irish Ó Frighil meaning "descendant of Fearghal".
Fylan Irish
Variant of Whelan.
Gallagher Irish
Anglicized form of the Irish Ó Gallchobhair meaning "descendant of Gallchobhar".
Glen Scottish
Variant of Glenn.
Glenn Scottish, English
From place names derived from Gaelic gleann "valley". A famous bearer was the American astronaut John Glenn (1921-2016).
Gough 2 Irish
Anglicized form of Irish Gaelic Mag Eochadha meaning "son of Eochaidh".
Guinness Irish
Variant of McGuinness. The name is well known because of the Guinness brand of ale, established in 1759 by Arthur Guinness.
Hayes 2 Irish
Anglicized form of Irish Ó hAodha meaning "descendant of Aodh".
Hearn Irish
Anglicized form of Ó hEachthighearna.
Hennessy Irish
Anglicized form of Irish Ó hAonghuis meaning "descendant of Aonghus".
Hughes 2 Irish, Scottish
Anglicized form of Mac Aodha.
Hyland 2 Irish
Variant of Whelan.
Innes 1 Scottish
From a place name derived from Gaelic inis meaning "island".
Innes 2 Scottish
From the given name Aonghus.
Kane Irish
Anglicized form of Ó Catháin.
Kavanagh Irish
Derived from the Irish Gaelic name Caomhánach, which means "a student of saint Caomhán". It was the name used by a 12th-century king of Leinster, Domhnall Caomhánach, the eldest son of the historic Irish king Diarmait Mac Murchada.
Kean Irish
Anglicized form of Ó Catháin.
Keane Irish
Anglicized form of Ó Catháin.
Keefe Irish
Anglicized form of the Irish Ó Caoimh meaning "descendant of Caomh".
Keegan Irish
From Irish Mac Aodhagáin meaning "descendant of Aodhagán". The given name Aodhagán is a double diminutive of Aodh.
Kelley Irish
Variant of Kelly 1.
Kelly 1 Irish
Anglicized form of Irish Ó Ceallaigh meaning "descendant of Ceallach". Famous bearers include actor and dancer Gene Kelly (1912-1996) and actress and princess Grace Kelly (1929-1982).
Kennedy Irish
From the Irish name Ó Cinnéidigh meaning "descendant of Cennétig". This surname was borne by assassinated American president John F. Kennedy (1917-1963).
Kermit Manx
Anglicized form of Mac Diarmada (see McDermott).
Kermode Manx
Anglicized form of Mac Diarmada (see McDermott).
Key 2 Irish
Anglicized form of Mac Aodha.
Keyes 2 Irish
Anglicized form of Mac Aodha.
Keys 2 Irish
Anglicized form of Mac Aodha.
Kilduff Irish
From the Irish Mac Giolla Dhuibh meaning "son of the black-haired man".
Kinley Scottish
Anglicized form of MacFhionnlaigh.
Kyle Scottish
Derived from Scottish Gaelic caol meaning "narrows, channel, strait", originally given to a person who lived by a strait.
Kyles Scottish
Variant of Kyle.
Mac Amhalghaidh Irish
Irish Gaelic form of McCauley.
MacAmhalghaidh Scottish Gaelic
Scottish Gaelic form of McCauley.
Mac an Fhilidh Scottish Gaelic
Scottish Gaelic form of McNeilly.
Mac Aodha Irish
Means "son of Aodh" in Irish.
Mac Aodhagáin Irish
Irish Gaelic form of Keegan.
MacAoidh Scottish Gaelic
Scottish Gaelic form of Mac Aodha.
MacAonghais Scottish Gaelic
Scottish Gaelic form of MacInnes.
MacBeth Scottish
Derived from the Gaelic given name Mac Beatha meaning "son of life", which denoted a man of religious devotion. This was the name of an 11th-century Scottish king, and the name of a play based on his life by William Shakespeare.
Mac Branáin Irish
Means "son of Branán" in Irish. The given name Branán is a diminutive of Bran 1.
MacCailein Scottish Gaelic
Means "son of Cailean" in Gaelic.
MacCallion Scottish
Anglicized form of MacCailein.
Mac Cárthaigh Irish
Irish Gaelic form of McCarthy.
Mac Cionaodha Irish
Irish Gaelic form of McKenna.
MacCionaodha Scottish Gaelic
Scottish Gaelic form of McKenna.
MacCoinnich Scottish Gaelic
Scottish Gaelic form of MacKenzie.
Mac Cormaic Irish
Irish Gaelic form of McCormick.
MacCormaic Scottish Gaelic
Scottish Gaelic form of McCormick.
MacDhòmhnaill Scottish Gaelic
Scottish Gaelic form of MacDonald.
MacDhubhghaill Scottish Gaelic
Scottish Gaelic form of MacDougall.
Mac Dhuibh Scottish Gaelic
Means "son of Dubh", where the byname Dubh means "dark".
Mac Diarmada Irish
Irish Gaelic form of McDermott.
MacDonald Scottish
Anglicized form of Scottish Gaelic MacDhòmhnaill meaning "son of Donald". It originates from the Highland clan Donald.
MacDougall Scottish
Means "son of Dougal" in Gaelic.
MacDuff Scottish
Anglicized form of Mac Dhuibh.
Mac Eachairn Scottish Gaelic
Means "son of Eacharn", where the given name Eacharn is from the Old Irish name Echthigern.
MacEachern Scottish
Anglicized form of Mac Eachairn.
Mac Eoghain Irish
Means "son of Eoghan" in Irish.
MacEòghainn Scottish Gaelic
Scottish Gaelic form of Mac Eoghain.
MacFhionnlaigh Scottish Gaelic
Means "son of Fionnlagh" in Scottish Gaelic.
Mac Giolla Bhrighde Irish
Means "son of the servant of Brighid" in Irish.
Mac Giolla Dhuibh Irish
Irish Gaelic form of Kilduff.
MacInnes Scottish
Anglicized form of Scottish Gaelic Mac Aonghais meaning "son of Aonghas".
Mack 1 Scottish, Irish
Shortened form of various Irish and Scottish surnames beginning with Mac or Mc (from Irish mac meaning "son").
MacKay Scottish
Anglicized form of MacAoidh.
MacKenzie Scottish
Anglicized form of Gaelic MacCoinnich meaning "son of Coinneach". It originates from the Kintail area of Scotland on the northwest coast.
Mac Mathghamhna Irish
Irish Gaelic form of McMahon.
Mac Naoimhín Irish
Means "son of Naomhán" in Irish.
Mac Neachtain Irish
Means "son of Nechtan" in Irish.
Mac Néill Irish
Irish form of McNeil.
MacNèill Scottish Gaelic
Scottish Gaelic form of McNeil.
MacNevin Irish
Anglicized form of Mac Naoimhín.
MacNiven Scottish
Anglicized form of Mac Naoimhín.
MacQueen Scottish
Anglicized form of Mac Shuibhne.
MacRuaraidh Scottish Gaelic
Scottish Gaelic form of McCrory.
Mac Síthigh Irish
Irish Gaelic form of McSheehy.
Mac Suibhne Irish
Means "son of Suibhne" in Irish.
Mac Thaidhg Irish
Irish Gaelic form of McCaig.
MacThaoig Scottish Gaelic
Scottish Gaelic form of McCaig.
Mag Aonghuis Irish
Irish Gaelic form of McGuinness.
Magee Irish, Scottish
Anglicized form of Mac Aodha.
Mag Eochadha Irish
Irish Gaelic form of McGough.
Mahoney Irish
Anglicized form of the Irish Ó Mathghamhna meaning "descendant of Mathgamain".
Mallon Irish
Variant of Malone.
Malloye Irish
Variant of Molloy.
Malone Irish
Anglicized form of Irish Ó Maoil Eoin meaning "descendant of a disciple of Saint John".
Manning 2 Irish
Anglicized form of Irish Ó Mainnín meaning "descendant of Mainchín".
McBride Irish
Anglicized form of Mac Giolla Bhrighde.
McCaig Scottish
Anglicized form of Scottish Gaelic MacThaoig meaning "son of Tadhg".
McCarthy Irish
Anglicized form of Irish Mac Cárthaigh meaning "son of Carthach".
McCauley Irish, Scottish
Anglicized form of Gaelic Mac Amhalghaidh or Mac Amhalghadha meaning "son of Amhalghaidh". The given name Amhalghaidh, from Old Irish Amalgaid, is of uncertain meaning.
McClelland Irish, Scottish
From Gaelic Mac Giolla Fhaoláin meaning "son of the servant of Faolán".
McConnell Scottish, Irish
Derived from Gaelic MacDhòmhnaill (see MacDonald).
McCormick Irish, Scottish
From Gaelic Mac Cormaic meaning "son of Cormac".
McCoy Scottish
Anglicized form of MacAoidh.
McCracken Irish, Scottish
Anglicized form of Mac Reachtain, Ulster Irish variant of Mac Neachtain.
McCrory Irish, Scottish
Anglicized form of Gaelic Mac Ruaidhrí meaning "son of Ruaidhrí".
McCune Irish
Anglicized form of Mac Eoghain.
McDermott Irish
Anglicized form of Irish Mac Diarmada meaning "son of Diarmaid". The McDermotts were nobility in the Kingdom of Connaught, a province in Ireland.
McEachern Scottish
Anglicized form of Mac Eachairn.
McEwan Scottish
Anglicized form of MacEòghainn.
McGee Irish, Scottish
Anglicized form of Mac Aodha.
McGough Irish
Variant of Gough 2.
McGuinness Irish
Anglicized form of Irish Mag Aonghuis meaning "son of Aonghus".
McKay Scottish
Anglicized form of MacAoidh.
McKee Scottish, Irish
Anglicized form of Mac Aodha.
McKenna Irish, Scottish
Anglicized form of Gaelic Mac Cionaodha meaning "son of Cionaodh".
McKinley Scottish
Anglicized form of MacFhionnlaigh. This name was borne by the American president William McKinley (1843-1901), who was assassinated.
McKowen Irish
Anglicized form of Mac Eoghain.
McMahon Irish
Anglicized form of Irish Mac Mathghamhna meaning "son of Mathgamain".
McNeil Scottish
Anglicized form of Gaelic MacNèill meaning "son of Niall".
McNeilly Scottish
Anglicized form of Gaelic Mac an Fhilidh meaning "son of the poet".
McQueen Scottish
Anglicized form of Mac Shuibhne.
McSheehy Irish
Anglicized form of Irish Gaelic Mac Síthigh, meaning "son of Sítheach".
Merrill 1 English
Derived from the given name Muriel.
Mollown Irish
Variant of Malone.
Monroe Scottish
Anglicized (typically American) form of Munro. It was borne by the American actress Marilyn Monroe (1926-1962).
Moriarty Irish
From Irish Ó Muircheartach meaning "descendant of Muirchertach". This was the surname given by Arthur Conan Doyle to a master criminal in the Sherlock Holmes series.
Mulloy Irish
Variant of Molloy.
Mulryan Irish
Anglicized form of Ó Maoil Riain.
Munro Scottish
Designated a person who had originally lived near the mouth of the Roe River in Derry, Ireland. It is derived from Gaelic bun meaning "root, base" combined with the river's name.
Munroe Scottish
Anglicized (typically Canadian and American) form of Munro.
Murdoch Scottish
Scottish form of Murdock.
Murdock Irish
Derived from the given name Murchadh.
Murphy Irish
Anglicized form of Irish Ó Murchadha meaning "descendant of Murchadh". This is the most common Irish surname.
Murray 2 Irish
Anglicized form of Irish Ó Muireadhaigh meaning "descendant of Muireadhach".
Neal English
Derived from the given name Neil.
Neil Scottish, English, Irish
Derived from the given name Neil.
Nelson 1 English
Means "son of Neil". This name was borne by the British admiral Horatio Nelson (1758-1805).
Nevin 1 Irish
Anglicized form of Mac Naoimhín.
Nigel English
Derived from the given name Neil.
Niles English
Means "son of Neil".
Niven Scottish
Anglicized form of Mac Naoimhín.
O'Berne Irish
Variant of O'Byrne.
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.
O'Byrne Irish
Anglicized form of Irish Ó Broin meaning "descendant of Bran 1".
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 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 Ciardha Irish
Irish Gaelic form of Carey.
Ó Cinnéidigh Irish
Irish Gaelic form of Kennedy.
Ó Coileáin Irish
Means "descendant of Coileán" in Irish.
Ó Conaill Irish
Irish Gaelic form of Connell.
Ó Conchobhair Irish
Irish Gaelic form of O'Connor.
O'Connor Irish
From Irish Ó Conchobhair meaning "descendant of Conchobar".
Ó Cuinn Irish
Irish Gaelic form of Quinn.
Ó Cuinneagáin Irish
Irish Gaelic form of Cunningham 2.
Ó Dálaigh Irish
Irish Gaelic form of Daly.
Ó Damháin Irish
Means "descendant of Damhán".
Ó Deasmhumhnaigh Irish
Irish Gaelic form of Desmond.
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".
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 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.