Name Agasthenes Gender Masculine Usage Ancient Greek, Greek Mythology Scripts Ἀγασθένης(Ancient Greek) Edit Status Status Meaning & History Means "very strong", derived from Greek ἄγαν (agan) meaning "very, much" and σθένος (sthenos) meaning "vigour, strength". This was the name of a king of Elis from Greek mythology, and of one of the Gigantes slain during the Gigantomachy.