Jillian is a moderately popular girls' name in United States, ranking #120 in 2000 with 2,779 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has increased by 90.1%. In 2000, approximately 1 in every 653 girls born was named Jillian. FALLING Recent data shows the name is currently falling.