Cailyn is a distinctive girls' name in United States, ranking #1477 in 2001 with 127 recorded births. The name reached its all-time peak in 2009 with 401 births ranking #723. Since 1996, the popularity has increased by 35.1%. In 2001, approximately 1 in every 14,178 girls born was named Cailyn. FALLING Recent data shows the name is currently falling.