Within the UK and Ireland, the surname Macmahon most frequently occurs in Ireland where it is carried by 1 in every 2,860 people. The majority of those with the family name of Macmahon are to be found living in/around Leinster, Munster and, to a lesser extent, Ulster. The name can also be found in England with just 1 in every 141,008 people using it.
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