Jillian is a moderately popular girls' name in United States, ranking #174 in 2008 with 1,905 recorded births. The name reached its all-time peak in 2001 with 2,847 births ranking #120. Since 1996, the popularity has increased by 30.3%. In 2008, approximately 1 in every 993 girls born was named Jillian. FALLING Recent data shows the name is currently falling.