Kailyn is a distinctive girls' name in United States, ranking #619 in 1999 with 389 recorded births. The name reached its all-time peak in 2011 with 793 births ranking #397. Since 1996, the popularity has increased by 31.9%. In 1999, approximately 1 in every 4,560 girls born was named Kailyn. FALLING Recent data shows the name is currently falling.