Jillian is a moderately popular girls' name in United States, ranking #385 in 2014 with 848 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has decreased by 42.0%. In 2014, approximately 1 in every 2,106 girls born was named Jillian. FALLING Recent data shows the name is currently falling.