Kailyn is a distinctive girls' name in United States, ranking #554 in 2003 with 499 recorded births. The name reached its all-time peak in 2011 with 793 births ranking #397. Since 1996, the popularity has increased by 69.2%. In 2003, approximately 1 in every 3,661 girls born was named Kailyn. FALLING Recent data shows the name is currently falling.