On June 24, 1978, Christy first suggested the name Charon as a scientific-sounding version of his wife Charlene\'s nickname, \"Char\". Although colleagues at the Naval Observatory proposed Persephone, Christy stuck with Charon after discovering it coincidentally refers to a Greek mythological figure: Charon is the ferryman of the dead, closely associated in myth with the god Hades, whom the Romans identified with their god Pluto. Official adoption of the name by the IAU waited until late 1985 and was announced on January 3, 1986.

https://en.wikipedia.org/wiki/Charon_(moon)

검색해보고 저도 지금 알았는데 발견자가 자신의 아내 이름과 비슷한 이름을 제안했는데 우연히 그게 그리스 신화에 나오는 뱃사공 이름과 겹쳤고 그게 또 저승의 왕인 pluto와 연결되어 있는 이름이었다고 하네요. 크크.