Original: The formal name "Nix", from the Greek goddess of darkness and night, and mother of Charon, was announced on June 21, 2006, on IAU Circular 8723, where the designation Pluto II is also given.
Simplified: The formal name "Nix", from the Greek goddess of darkness and night, and mother of Charon, was announced on June 21, 2006 on IAU Circular 8723, where the designation Pluto II is also given.