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Cognomen Irwin (Irwin , Ирвин , אירווין ) , around the world, is a common surname. The surname Irwin is habitual in Ireland, where it is quite a common surname, Jersey, and Australia (explore the name in all countries). Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Canada. Also, Irwin is the forename as well as the last name.