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My O'Rooney family came from: -Select- I don't know Antrim Armagh Carlow Cavan Clare Cork Derry Donegal Down Dublin Fermanagh Galway Kerry Kildare Kilkenny Laois Leitrim Limerick Longford Louth Mayo Meath Monaghan Offaly Roscommon Sligo Tipperary Tyrone Waterford Westmeath Wexford Wicklow
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The Irish surname Rooney originates from the Gaelic surname "O' Ruanaidh" which translates to the "descendants of the champion".
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Origins unknown.