Kailyn is a moderately popular girls' name in United States, ranking #493 in 2006 with 626 recorded births. The name reached its all-time peak in 2011 with 793 births ranking #397. Since 1996, the popularity has increased by 112.2%. In 2006, approximately 1 in every 3,037 girls born was named Kailyn. FALLING Recent data shows the name is currently falling.