Within the UK and Ireland, the surname Hannigan most frequently occurs in Ireland where it is carried by 1 in every 2,798 people. The majority of those with the family name of Hannigan are to be found living in/around Leinster (approx. 20% of all UK Hannigan's), Ulster and Munster. The name can also be found in Scotland with 1 in 13,575 people using it, and England with 1 in 52,911.
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