Kailyn is a distinctive girls' name in United States, ranking #651 in 1998 with 355 recorded births. The name reached its all-time peak in 2011 with 793 births ranking #397. Since 1996, the popularity has increased by 20.3%. In 1998, approximately 1 in every 4,977 girls born was named Kailyn. FALLING Recent data shows the name is currently falling.