Gillian is a distinctive girls' name in United States, ranking #3135 in 2022 with 52 recorded births. The name reached its all-time peak in 1999 with 1,022 births ranking #303. Since 1996, the popularity has decreased by 86.3%. In 2022, approximately 1 in every 31,515 girls born was named Gillian. STABLE Recent data shows the name is currently stable.