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Last name Kirwan (Kirwan , 柯万 , كيروان ) , across the world, is a common cognomen. The family name Kirwan is habitual in Ireland, where it is quite a common surname, Saint Kitts and Nevis, and Antigua and Barbuda (explore the name in all countries). In absolute terms, this name is the most popular in Ireland, the United States, and the United Kingdom. Much less frequently, Kirwan is the forename as well as the last name.