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Surname Kosak (Kozak , Kosak , Косак ) , across the world, is a common family name. The last name Kosak is characteristic of Eastern Europe, particularly Slovakia, where it is quite a common surname, Hungary, and Poland (explore the name in all countries). Measured by absolute frequency, the name is most common in Poland, the United States, and Turkey. Also, Kosak is the forename as well as the last name.