What does the name Gillian mean? The meaning of the name Gillian is Youthful, Downy. The origin of the name Gillian is English. This is the culture in which the name originated, or in the case of a word, the language.
Alternate spellings: Jillian
People who like the name Gillian also like: Charlotte
, Emma Liam
Name Notes: Originally a feminine form of Julian. Gillian Anderson, actress.