Cailyn is a distinctive girls' name in United States, ranking #1107 in 2004 with 206 recorded births. The name reached its all-time peak in 2009 with 401 births ranking #723. Since 1996, the popularity has increased by 119.1%. In 2004, approximately 1 in every 8,913 girls born was named Cailyn. FALLING Recent data shows the name is currently falling.