Within the UK and Ireland, the surname Monahan most frequently occurs in Ireland where it is carried by 1 in every 2,580 people. The majority of those with the family name of Monahan are to be found living in/around Leinster (approx. 41% of all UK Monahan's), Connaught and Ulster. The name can also be found in England with 1 in 61,856 people using it.
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