Jillian is a moderately popular girls' name in United States, ranking #166 in 1997 with 1,849 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has increased by 26.5%. In 1997, approximately 1 in every 941 girls born was named Jillian. FALLING Recent data shows the name is currently falling.