Kailyn is a distinctive girls' name in United States, ranking #659 in 2015 with 436 recorded births. The name reached its all-time peak in 2011 with 793 births ranking #397. Since 1996, the popularity has increased by 47.8%. In 2015, approximately 1 in every 4,093 girls born was named Kailyn. FALLING Recent data shows the name is currently falling.