Cailyn is a distinctive girls' name in United States, ranking #1125 in 2005 with 209 recorded births. The name reached its all-time peak in 2009 with 401 births ranking #723. Since 1996, the popularity has increased by 122.3%. In 2005, approximately 1 in every 8,841 girls born was named Cailyn. FALLING Recent data shows the name is currently falling.