Gillian is a distinctive girls' name in United States, ranking #661 in 2005 with 420 recorded births. The name reached its all-time peak in 1999 with 1,022 births ranking #303. Since 1996, the popularity has increased by 10.8%. In 2005, approximately 1 in every 4,399 girls born was named Gillian. STABLE Recent data shows the name is currently stable.