About the name Gillian
Gillian belongs to the English & American tradition. Its roots are documented, even though its precise meaning is not recorded in the standard references — an honest gap we prefer to a confident guess.
In the United States, Gillian first appears in Social Security records in 1922. It climbed to its best-ever rank of #303 in 1999, and in 2024 51 babies received the name — 16,011 in total since 1880. Those are the official counts, not estimates.