Irwin, Erwin An English surname from the Old English Eoforwine meaning ‘boar-friend’. This surname is often confused with Irvine. In 1890 Irwin was principally found in Armagh, Antrim, Tyrone and Derry, and the estimated number of bearers was 5,280. In the United States Irwin is the 939th most numerous surname with an estimated 5,500 bearers.
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