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Cognomen Davidoff (Davidoff , دافيدوف, Давидофф ) , in all the world, is quite a rare surname. The cognomen Davidoff is habitual in Israel, where it is quite a rare surname, Switzerland, and Denmark, where it is a rare surname. In absolute terms, it is the most numerous in the United States, Israel, and Canada. Very seldom, Davidoff is the forename as well as the last name.