Jillian is a moderately popular girls' name in United States, ranking #187 in 2007 with 1,787 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has increased by 22.2%. In 2007, approximately 1 in every 1,076 girls born was named Jillian. FALLING Recent data shows the name is currently falling.