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Cognomen Issak (יצחק , Issak , Иссак ) , throughout the world, is a common family name. The last name Issak is habitual in Israel, where it is quite a common surname, Somalia, where it is quite a rare surname, and Estonia. In absolute terms, it most frequently occurs in Israel, Kenya, and Somalia. More prevalently, Issak is the forename as well as the last name.