Jillian is a moderately popular girls' name in United States, ranking #161 in 2005 with 2,121 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has increased by 45.1%. In 2005, approximately 1 in every 871 girls born was named Jillian. FALLING Recent data shows the name is currently falling.