Jillian is a moderately popular girls' name in United States, ranking #158 in 1998 with 2,015 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has increased by 37.8%. In 1998, approximately 1 in every 877 girls born was named Jillian. FALLING Recent data shows the name is currently falling.