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Family name Αδαμάντιος (Adamantios , Αδαμάντιος ) , around the globe, is quite a rare cognomen. The cognomen Αδαμάντιος is habitual in Greece, where it is quite a common surname, Spain, where it is a very rare surname, and China, where it is an extremely rare surname. Also, Αδαμάντιος is the forename as well as the last name.