Charon

From Latin Charōn, from Ancient Greek Χάρων (Khárōn). The name of the moon was coined by American astronomer James W. Christy in 1978, in reference to a fictional moon of Pluto in a novel by Edmond Hamilton but also influenced by its similarity to Char, a pet name for Charlene, his wife's name — hence the alternative American pronunciation, which is used at NASA.