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Cognomen Karls (Karls , كارلس , Карлс ) , across the world, is quite a rare family name. The last name Karls is habitual in Iceland, where it is quite a rare surname, Sweden, and Germany, where it is a rare surname. In absolute terms, it most frequently occurs in the United States, Germany, and Sweden. Much less frequently, Karls is the forename as well as the last name.