Within the UK and Ireland, the surname Isaac most frequently occurs in Wales where it is carried by 1 in every 2,187 people. The majority of those with the family name of Isaac are to be found living in/around City and County of Swansea (approx. 3% of all UK Isaac's), Carmarthenshire and Neath Port Talbot County Borough. The name can also be found in England with 1 in 11,261 people using it.
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