Gillian is a distinctive girls' name in United States, ranking #2288 in 2017 with 81 recorded births. The name reached its all-time peak in 1999 with 1,022 births ranking #303. Since 1996, the popularity has decreased by 78.6%. In 2017, approximately 1 in every 21,307 girls born was named Gillian. STABLE Recent data shows the name is currently stable.