Gillian is a distinctive girls' name in United States, ranking #2151 in 2018 with 88 recorded births. The name reached its all-time peak in 1999 with 1,022 births ranking #303. Since 1996, the popularity has decreased by 76.8%. In 2018, approximately 1 in every 19,323 girls born was named Gillian. STABLE Recent data shows the name is currently stable.