Gillian is a moderately popular girls' name in United States, ranking #466 in 2003 with 638 recorded births. The name reached its all-time peak in 1999 with 1,022 births ranking #303. Since 1996, the popularity has increased by 68.3%. In 2003, approximately 1 in every 2,864 girls born was named Gillian. STABLE Recent data shows the name is currently stable.