Kailyn is a distinctive girls' name in United States, ranking #589 in 2002 with 438 recorded births. The name reached its all-time peak in 2011 with 793 births ranking #397. Since 1996, the popularity has increased by 48.5%. In 2002, approximately 1 in every 4,102 girls born was named Kailyn. FALLING Recent data shows the name is currently falling.