Most Common Irish Surnames

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 The top 100 Irish surnames as compiled by  ireland-information.com/heraldichall/irishsurnames.htm . They have been placed in alphabetical order.

Barry

 Bell

 Boyle

 Brady

 Brennan

 Brown

 Buckley

 Burke

 Burns

 Byrne

 Campbell

 Casey

 Clarke

 Collins

 Connolly

 Cullen

 Cunningham

 Daly

 Donnelly

 Donovan

 Doyle

 Duffy

 Dunne

 Fitzgerald

 Fitzpatrick

 Flanagan

 Flynn

 Foley

 Gallagher

 Graham

 Griffin

 Hayes

 Healy

 Higgins

 Hogan

 Hughes

 Johnston

 Kane

 Kavanagh

 Keane

 Kelly

 Kennedy

 Kenny

 King

 Lynch

 Lyons

 MacDermott

 MacDonald

 MacKenna

 MacMahon

 MacNamara

 Magee

 Maguire

 Maher

 Martin

 McCarthy

 McDonnell

 McGrath

 McLoughlin

 Molony

 Moore

 Moran

 Mullan

 Murphy

 Murray

 Nolan

 O'Brien

 O'Callaghan

 O'Carroll

 O'Connell

 O'Connor

 O'Doherty

 O'Donnell

 O'Dwyer

 O'Farrell

 O'Keeffe

 O'Leary

 O'Mahony

 O'Neill

 O'Reilly

 O'Rourke

 O'Shea

 O'Sullivan

 Power

 Quinn

 Regan

 Reid

 Robinson

 Ryan

 Scott

 Sheehan

 Smith

 Stewart

 Sweeney

 Thompson

 Walsh

 Ward

 Whelan

 White

 Wilson

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