Meaning:
Its source is Julian, a Latin name meaning "Jove's descendant."
Nicknames: Gillie, Jill, Lian and Jyl
Variant Forms: Gilenia and Jilliann
Popularity:
The name Gillian ranked 375th in popularity for females of all ages in a sample of 2000-2003 Social Security Administration statistics and 1252nd in popularity for females of all ages in a sample of the 1990 US Census.
Though this name has fluctuated in use, it has been quietly present throughout the last century.