Cailyn is a distinctive girls' name in United States, ranking #1337 in 2015 with 177 recorded births. The name reached its all-time peak in 2009 with 401 births ranking #723. Since 1996, the popularity has increased by 88.3%. In 2015, approximately 1 in every 10,083 girls born was named Cailyn. FALLING Recent data shows the name is currently falling.