Kailyn is a distinctive girls' name in United States, ranking #511 in 2005 with 583 recorded births. The name reached its all-time peak in 2011 with 793 births ranking #397. Since 1996, the popularity has increased by 97.6%. In 2005, approximately 1 in every 3,169 girls born was named Kailyn. FALLING Recent data shows the name is currently falling.