Within the UK and Ireland, the surname Irwin most frequently occurs in Ireland where it is carried by 1 in every 939 people. The majority of those with the family name of Irwin are to be found living in/around Ulster (approx. 26% of all UK Irwin's), Munster and Leinster. The name can also be found in England with 1 in 8,117 people using it.
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