Jennilyn is a distinctive girls' name in United States, ranking #15451 in 1999 with 5 recorded births. The name reached its all-time peak in 1996 with 9 births ranking #9122. Since 1996, the popularity has decreased by 44.4%. In 1999, approximately 1 in every 354,756 girls born was named Jennilyn. RISING Recent data shows the name is currently rising.