Jillian is a moderately popular girls' name in United States, ranking #142 in 1999 with 2,280 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has increased by 56.0%. In 1999, approximately 1 in every 778 girls born was named Jillian. FALLING Recent data shows the name is currently falling.