Within the UK and Ireland, the surname Illsley most frequently occurs in England where it is carried by 1 in 52,961 people. The majority of those with the family name of Illsley are to be found living in/around Staffordshire (approx. 13% of all UK Illsley's), Nottinghamshire and Derbyshire. The name can also be found in Wales with 1 in 95,121 people using it, and Scotland with 1 in 146,757.
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