Kailyn is a distinctive girls' name in United States, ranking #593 in 2000 with 431 recorded births. The name reached its all-time peak in 2011 with 793 births ranking #397. Since 1996, the popularity has increased by 46.1%. In 2000, approximately 1 in every 4,213 girls born was named Kailyn. FALLING Recent data shows the name is currently falling.