[Surname] SURNAME DONNELLY ETHNIC BACKGROUND IRISH DUBLIN
INFORMATION ON SURNAME DONNELLY
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Donnelly is explained on this site under "Irish names". The explanation is, as far as my knowledge goes, accurate. I would add that the name is associated historically with the County Tyrone where there is a place now called Castle Caulfield, which was once called Ballydonnelly, "O'Donnelly's townland".