Within the UK and Ireland, the surname Costello most frequently occurs in Ireland where it is carried by 1 in every 590 people. The majority of those with the family name of Costello are to be found living in/around Leinster (approx. 19% of all UK Costello's), Connaught and Munster. The name can also be found in England with 1 in 6,487 people using it.
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