Gillian is a distinctive girls' name in United States, ranking #2833 in 2019 with 59 recorded births. The name reached its all-time peak in 1999 with 1,022 births ranking #303. Since 1996, the popularity has decreased by 84.4%. In 2019, approximately 1 in every 28,433 girls born was named Gillian. STABLE Recent data shows the name is currently stable.