Jillian is a distinctive girls' name in United States, ranking #1266 in 2025 with 177 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has decreased by 87.9%. In 2025, approximately 1 in every 9,081 girls born was named Jillian. FALLING Recent data shows the name is currently falling.