Cognomen Adamantios (Adamantios 
, Αδαμάντιος , Адамантиос) , around the globe, is quite a rare family name. The family name Adamantios 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. Likewise, Adamantios is the forename as well as the last name.