Gillian is a distinctive girls' name in United States, ranking #1267 in 2011 with 188 recorded births. The name reached its all-time peak in 1999 with 1,022 births ranking #303. Since 1996, the popularity has decreased by 50.4%. In 2011, approximately 1 in every 9,355 girls born was named Gillian. STABLE Recent data shows the name is currently stable.