The name Celestia is a girl's name of Latin origin meaning "heavenly". Celestia and is often added to lists like Unique Girl Names: Unusual and Rare and discussed in our forums with posts like "Pick 5 (GIRLS)".
From the experts:
Celestia is a heavenly name that sounds more ethereal than Celeste, Celestia might make a distinctive, feminine choice if your taste runs toward names like Angelina and Seraphina.
Celestia was more popular than you might think in the late nineteenth century -- it made the popularity list six times in the 1880s. Celestia was the middle name of Caroline (Carrie) Ingalls in "Little House on the Prairie."