Follow an Irish surname through the census record.
Browse surnames with verified history notes and source-backed county signals. These pages offer historical clues, not proof of an exact ancestor or a single family origin.
78 surnames
Data notes last updated 2026-06-12.
Barry
Strong signals: Longford, Roscommon, Cork
Explore the evidence →Boyle
Strong signals: Roscommon, Laois, Monaghan
Explore the evidence →Brady
Strong signals: Leitrim, Monaghan
Explore the evidence →Brennan
Strong signals: Kerry, Galway, Longford
Explore the evidence →Burke
Strong signals: Mayo, Tipperary, Galway
Explore the evidence →Byrne
Strong signals: Kerry, Kildare, Donegal
Explore the evidence →Callaghan
Strong signals: Armagh, Clare, Longford
Explore the evidence →Campbell
Strong signals: Down, Longford
Explore the evidence →Carroll
Strong signals: Down
Explore the evidence →Casey
Strong signals: Tyrone, Donegal
Explore the evidence →Clarke
Strong signals: Tyrone
Explore the evidence →Collins
Strong signals: Laois, Antrim, Clare
Explore the evidence →Connolly
Strong signals: Laois, Meath, Waterford
Explore the evidence →Costello
Strong signals: Mayo, Roscommon, Galway
Explore the evidence →Curran
Strong signals: Wexford, Londonderry, Monaghan
Explore the evidence →Daly
Strong signals: Galway, Offaly, Cork
Explore the evidence →Doherty
Strong signals: Wicklow, Donegal, Kilkenny
Explore the evidence →Doyle
Strong signals: Dublin
Explore the evidence →Duffy
Strong signals: Cavan, Leitrim, Londonderry
Explore the evidence →Dunne
Strong signals: Antrim, Kerry, Laois
Explore the evidence →Farrell
Strong signals: Antrim, Longford, Offaly
Explore the evidence →Fitzgerald
Strong signals: Cork
Explore the evidence →Fitzpatrick
Strong signals: Cork, Wexford, Tipperary
Explore the evidence →Flanagan
Strong signals: Roscommon, Wicklow, Donegal
Explore the evidence →Flynn
Strong signals: Antrim, Westmeath, Limerick
Explore the evidence →Foley
Strong signals: Armagh
Explore the evidence →Gallagher
Strong signals: Offaly
Explore the evidence →Harrington
Strong signals: Waterford, Cavan, Galway
Explore the evidence →Hayes
Strong signals: Tipperary, Clare, Down
Explore the evidence →Healy
Strong signals: Louth, Tipperary, Armagh
Explore the evidence →Hughes
Strong signals: Tipperary, Clare, Down
Explore the evidence →Johnston
Strong signals: Cork, Mayo, Wexford
Explore the evidence →Kavanagh
Strong signals: Cavan, Fermanagh
Explore the evidence →Keane
Strong signals: Louth, Down, Cork
Explore the evidence →Kearney
Strong signals: Down, Sligo, Antrim
Explore the evidence →Kelly
Strong signals: Galway, Antrim, Roscommon
Explore the evidence →Kennedy
Strong signals: Antrim, Longford, Wicklow
Explore the evidence →Lynch
Strong signals: Mayo, Galway, Tipperary
Explore the evidence →MacDonald
Strong signals: Antrim, Tyrone, Armagh
Explore the evidence →Maguire
Strong signals: Cork, Dublin, Leitrim
Explore the evidence →McCarthy
Strong signals: Cork, Kilkenny, Clare
Explore the evidence →McDermott
Strong signals: Cork, Antrim, Armagh
Explore the evidence →McGrath
Strong signals: Antrim, Clare, Donegal
Explore the evidence →McKenna
Strong signals: Cavan, Down, Leitrim
Explore the evidence →McLoughlin
Strong signals: Mayo, Cork, Galway
Explore the evidence →McMahon
Strong signals: Galway, Cork, Down
Explore the evidence →Molloy
Strong signals: Waterford, Cavan, Galway
Explore the evidence →Moore
Strong signals: Cork, Roscommon, Tipperary
Explore the evidence →Moran
Strong signals: Leitrim, Galway, Mayo
Explore the evidence →Mulligan
Strong signals: Leitrim
Explore the evidence →Murphy
Strong signals: Galway, Clare, Down
Explore the evidence →Murray
Strong signals: Down, Kerry, Monaghan
Explore the evidence →Nolan
Strong signals: Carlow, Cork, Laois
Explore the evidence →O'Brien
Strong signals: Tipperary, Clare, Cork
Explore the evidence →O'Connell
Strong signals: Kildare, Cork, Armagh
Explore the evidence →O'Connor
Strong signals: Antrim, Down, Clare
Explore the evidence →O'Donnell
Strong signals: Wexford, Cork, Antrim
Explore the evidence →O'Neill
Strong signals: Londonderry, Monaghan, Tyrone
Explore the evidence →O'Sullivan / Sullivan
Strong signals: Laois, Meath, Waterford
Explore the evidence →ODonoghue
Strong signals: Galway, Longford, Offaly
Explore the evidence →ODwyer
Strong signals: Cork
Explore the evidence →OLeary
Strong signals: Cork, Clare, Dublin
Explore the evidence →ORourke
Strong signals: Limerick, Mayo, Tipperary
Explore the evidence →OShea
Strong signals: Clare, Kilkenny, Wexford
Explore the evidence →Power
Strong signals: Clare, Waterford
Explore the evidence →Quinn
Strong signals: Clare, Donegal, Kerry
Explore the evidence →Regan
Strong signals: Wexford, Galway, Cork
Explore the evidence →Reilly
Strong signals: Sligo, Waterford, Cavan
Explore the evidence →Rooney
Strong signals: Donegal, Monaghan
Explore the evidence →Ryan
Strong signals: Tipperary, Carlow, Donegal
Explore the evidence →Scanlon
Strong signals: Clare
Explore the evidence →Smith
Strong signals: Tipperary, Antrim, Down
Explore the evidence →Smyth
Strong signals: Tipperary, Antrim, Down
Explore the evidence →Stewart
Strong signals: Tyrone, Down
Explore the evidence →Sweeney
Strong signals: Cork, Galway, Laois
Explore the evidence →Walsh
Strong signals: Galway, Kerry, Londonderry
Explore the evidence →Whelan
Strong signals: Kerry, Longford, Wicklow
Explore the evidence →White
Strong signals: Kildare, Antrim, Fermanagh
Explore the evidence →