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Family name Diamantis (Diamantis , Διαμαντής , Адамантиос) , throughout the world, is a common surname. The last name Diamantis is habitual in Greece, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Bulgaria. In absolute terms, it is commonest in Greece, the United States, and Germany. Also, Diamantis is the forename as well as the last name.