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Cognomen Ben-Chaim (בן-חיים , Ben-Chaim ) , around the world, is a rare last name. The cognomen Ben-Chaim is habitual in Israel, where it is quite a rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Ben-Chaim is the forename as well as the last name. Parts of the name also exists independently as a first name Ben, and a first name Chaim.