Gillian is a distinctive girls' name in United States, ranking #1392 in 2012 with 166 recorded births. The name reached its all-time peak in 1999 with 1,022 births ranking #303. Since 1996, the popularity has decreased by 56.2%. In 2012, approximately 1 in every 10,607 girls born was named Gillian. STABLE Recent data shows the name is currently stable.