Within the UK and Ireland, the surname Callan most frequently occurs in Ireland where it is carried by 1 in every 2,067 people. The majority of those with the family name of Callan are to be found living in/around Leinster, Ulster and, to a lesser extent, Munster. The name can also be found in Scotland with 1 in 9,427 people using it, and England with 1 in 25,285.
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