Jillyan is a distinctive girls' name in United States, ranking #8750 in 2007 with 14 recorded births. The name reached its all-time peak in 1999 with 17 births ranking #6035. Since 1996, the popularity has increased by 100.0%. In 2007, approximately 1 in every 137,318 girls born was named Jillyan. FALLING Recent data shows the name is currently falling.