Gillian is a distinctive girls' name in United States, ranking #556 in 2004 with 513 recorded births. The name reached its all-time peak in 1999 with 1,022 births ranking #303. Since 1996, the popularity has increased by 35.4%. In 2004, approximately 1 in every 3,579 girls born was named Gillian. STABLE Recent data shows the name is currently stable.