Jillyan is a distinctive girls' name in United States, ranking #10777 in 2010 with 10 recorded births. The name reached its all-time peak in 1999 with 17 births ranking #6035. Since 1996, the popularity has increased by 42.9%. In 2010, approximately 1 in every 177,733 girls born was named Jillyan. FALLING Recent data shows the name is currently falling.