Jillyan is a distinctive girls' name in United States, ranking #15462 in 2013 with 6 recorded births. The name reached its all-time peak in 1999 with 17 births ranking #6035. Since 1996, the popularity has decreased by 14.3%. In 2013, approximately 1 in every 292,402 girls born was named Jillyan. FALLING Recent data shows the name is currently falling.