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Cognomen Bosak (Bosak , Босак , بوساك ) , around the world, is a common last name. The cognomen Bosak is habitual in Croatia, where it is quite a common surname, Slovakia, and Czechia, where it is quite a rare surname. Measured by absolute frequency, it is commonest in India, Ukraine, and the United States. Much less frequently, Bosak is the forename as well as the last name.