Cailyn is a distinctive girls' name in United States, ranking #723 in 2009 with 401 recorded births. The name reached its all-time peak in 2009 with 401 births ranking #723. Since 1996, the popularity has increased by 326.6%. In 2009, approximately 1 in every 4,581 girls born was named Cailyn. FALLING Recent data shows the name is currently falling.