Kailyn is a distinctive girls' name in United States, ranking #532 in 2004 with 533 recorded births. The name reached its all-time peak in 2011 with 793 births ranking #397. Since 1996, the popularity has increased by 80.7%. In 2004, approximately 1 in every 3,445 girls born was named Kailyn. FALLING Recent data shows the name is currently falling.