The name Celestial is a girl's name meaning "of the heavens, planets or stars". Celestial and is often added to lists like Space Baby Names and discussed in our forums with posts like "Adding Then Eliminating -- Girls Themed".
From the experts:
A pretty and almost unique word name to add to the galaxy of astral appellations. More distinctive than the better known Celeste, it was given to only nine girls last year. Celestial is also the title of several band albums, and is heard in the video game and comics worlds.