Ganymede

Trojan youth taken by Zeus as his cup-bearer (and lover), from Greek Ganymedes, perhaps a non-Greek name, or from ganymai "I rejoice, am glad" (related to ganos "brightness; sheen; gladness, joy; pride") + medea (plural) "counsels, plans, cunning" (see Medea); taken in Greek folk-etymology to mean "delighting in genitals." Used figuratively of serving-boys (c. 1600) and catamites (1590s). Associated with Aquarius in the zodiac. As the name of one of the four large satellites of Jupiter, by 1847.