Within the UK and Ireland, the surname Carthy most frequently occurs in Ireland where it is carried by 1 in every 3,821 people. The majority of those with the family name of Carthy are to be found living in/around Leinster (approx. 47% of all UK Carthy's), Connaught and Munster. The name can also be found in England with 1 in 62,339 people using it.
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