Jillian is a moderately popular girls' name in United States, ranking #135 in 2003 with 2,425 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has increased by 65.9%. In 2003, approximately 1 in every 753 girls born was named Jillian. FALLING Recent data shows the name is currently falling.