Jillian is a moderately popular girls' name in United States, ranking #170 in 2010 with 1,819 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has increased by 24.4%. In 2010, approximately 1 in every 977 girls born was named Jillian. FALLING Recent data shows the name is currently falling.