Within the UK and Ireland, the surname Mccullagh most frequently occurs in Ireland where it is carried by 1 in every 2,194 people. The majority of those with the family name of Mccullagh are to be found living in/around Ulster, Leinster and, to a lesser extent, Munster. The name can also be found in England with just 1 in every 159,034 people using it.
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