Jillian is a moderately popular girls' name in United States, ranking #440 in 2015 with 721 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has decreased by 50.7%. In 2015, approximately 1 in every 2,475 girls born was named Jillian. FALLING Recent data shows the name is currently falling.