Within the UK and Ireland, the surname Guilfoyle most frequently occurs in Ireland where it is carried by 1 in every 3,693 people. The majority of those with the family name of Guilfoyle are to be found living in/around Leinster, Munster and, to a lesser extent, Connaught. The name can also be found in England with 1 in 54,508 people using it.
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