Gillian is a distinctive girls' name in United States, ranking #1686 in 2014 with 125 recorded births. The name reached its all-time peak in 1999 with 1,022 births ranking #303. Since 1996, the popularity has decreased by 67.0%. In 2014, approximately 1 in every 14,287 girls born was named Gillian. STABLE Recent data shows the name is currently stable.