Jillyan is a distinctive girls' name in United States, ranking #6856 in 2002 with 16 recorded births. This places Jillyan in the top 38% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1999 with 17 births ranking #6035. Since 1996, the popularity has increased by 128.6%. In 2002, approximately 1 in every 112,301 girls born was named Jillyan. FALLING Recent data shows the name is currently falling.