Within the UK and Ireland, the surname Donnellan most frequently occurs in Ireland where it is carried by 1 in every 2,132 people. The majority of those with the family name of Donnellan are to be found living in/around Connaught (approx. 30% of all UK Donnellan's), Munster and Leinster. The name can also be found in England with 1 in 71,861 people using it.
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