Cailyn is a distinctive girls' name in United States, ranking #1245 in 1999 with 151 recorded births. The name reached its all-time peak in 2009 with 401 births ranking #723. Since 1996, the popularity has increased by 60.6%. In 1999, approximately 1 in every 11,747 girls born was named Cailyn. FALLING Recent data shows the name is currently falling.