Gillian is a moderately popular girls' name in United States, ranking #396 in 1997 with 659 recorded births. The name reached its all-time peak in 1999 with 1,022 births ranking #303. Since 1996, the popularity has increased by 73.9%. In 1997, approximately 1 in every 2,641 girls born was named Gillian. STABLE Recent data shows the name is currently stable.