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Irish surnames A–Z

We are starting with the most common names and adding more each week. O', Mc and Mac names are filed under the main part of the name.

Filter surnames

Surname	Also spelt	1911 census	Most numerous in
Barry		9,332	Cork
Bell		7,369	Antrim
Boyle	O'Boyle	11,594	Donegal
Brady		10,749	Cavan
Brennan	O'Brennan	14,630	Kilkenny
O'Brien	Brien	31,022	Cork
Brown	Browne	18,872	Antrim
Burke	Bourke	18,603	Galway
Byrne	Byrnes, O'Byrne	29,666	Dublin
O'Callaghan	Callaghan	10,997	Cork
Campbell		14,231	Antrim
McCann		7,185	Antrim
Carroll	O'Carroll, Carrol	14,420	Dublin
McCarthy	Carthy, MacCarthy	20,186	Cork
Casey		9,211	Cork
Clarke	Clark	14,965	Antrim
Collins		13,165	Cork
O'Connell	Connell	14,192	Cork
Connolly	Connelly, Conolly, Connally, O Connolly	14,164	Galway
O'Connor	Connor, Connors, OConner, OConnors	33,346	Kerry
McCormack	McCormick, MacCormack	9,913	Antrim
Cullen		7,229	Dublin
Cunningham		8,988	Down
Curran		7,241	Galway
Daly	Daley, O'Daly	14,646	Cork
McDermott	MacDermott, McDermot	7,283	Roscommon
Doherty	O'Doherty, Dougherty	18,848	Donegal
McDonald	MacDonald	7,779	Antrim
O'Donnell	Donnell	14,081	Donegal
McDonnell	MacDonnell	8,860	Dublin
Donnelly		8,648	Tyrone
O'Donoghue	Donohoe, Donoghue, Donohue, O'Donohue, O'Donohoe	11,587	Kerry
Donovan	O'Donovan	9,502	Cork
Doyle	O Doyle	20,423	Dublin
Duffy	Duffey, O'Duffy	12,160	Mayo
Dunne	Dunn, ODunne	13,827	Dublin
O'Dwyer	Dwyer	7,643	Tipperary
Farrell	O'Farrell, Farrel	13,219	Dublin
Fitzgerald		12,743	Cork
Fitzpatrick		9,626	Dublin
Flanagan	Flanigan, Flannagan, O'Flanagan	7,429	Roscommon
Flynn	O'Flynn, Flynne	14,078	Cork
Foley		8,818	Kerry
Gallagher	Gallacher, OGallagher	19,095	Donegal
Graham		8,719	Antrim
McGrath	Magrath, MacGrath	11,539	Tipperary
Griffin		7,582	Kerry
Hamilton		8,194	Antrim
Hayes	Hays	9,859	Cork
Healy	Healey, O'Healy	10,895	Cork
Higgins	O'Higgins	7,712	Mayo
Hogan	OHogan	7,359	Tipperary
Hughes		11,657	Dublin
Johnston	Johnstone	13,645	Antrim
O'Kane	Kane, OKane	7,760	Londonderry
Kavanagh	Cavanagh	10,110	Dublin
Keane	O'Keane	9,299	Galway
O'Keeffe	Keeffe, O'Keefe, Keefe	7,805	Cork
Kelly	O'Kelly, Kelley	46,474	Dublin
McKenna	MacKenna	8,571	Monaghan
Kennedy	O'Kennedy	17,665	Tipperary
Kenny	Kenney	9,294	Dublin
King		7,434	Galway
McLaughlin	McLoughlin, MacLaughlin	14,527	Donegal
O'Leary	Leary	9,833	Cork
Lynch		17,615	Cork
Lyons		7,581	Cork
Maguire	McGuire, MacGuire	12,738	Fermanagh
Maher		7,718	Tipperary
McMahon	MacMahon	9,577	Clare
O'Mahony	Mahony, Mahoney, O'Mahoney	11,003	Cork
Martin		13,505	Antrim
Moore	O'Moore	15,416	Antrim
Moran		10,610	Mayo
Murphy	Murphey, O Murphy	55,969	Cork
Murray		18,087	Dublin
McNamara	MacNamara	7,222	Clare
O'Neill	Neill, ONeil	25,475	Antrim
Nolan	O'Nolan	11,867	Dublin
Power		10,764	Waterford
Quinn	OQuinn	15,969	Tyrone
O'Regan	Regan	7,475	Cork
Reid		7,168	Antrim
O'Reilly	Reilly, Rielly, ORielly	24,389	Cavan
Robinson		8,508	Antrim
Roche	Roache, Roach	8,086	Cork
Ryan	O'Ryan	30,675	Tipperary
Scott		7,668	Antrim
O'Shea	Shea	11,511	Kerry
Sheehan	Sheahan	7,871	Cork
Smith	Smyth, Smythe	31,994	Cavan
Stewart	Stuart	9,854	Antrim
O'Sullivan	Sullivan	36,162	Cork
Sweeney	McSweeney, Sweeny, McSwiney, McSweeny	11,284	Cork
Thompson		11,666	Antrim
Walsh	Walshe	37,059	Cork
Ward	Warde	9,429	Donegal
Whelan		8,300	Dublin
White		9,739	Dublin
Wilson		14,110	Antrim