Cailin is a distinctive girls' name in United States, ranking #3557 in 2020 with 42 recorded births. The name reached its all-time peak in 2003 with 164 births ranking #1274. Since 1996, the popularity has decreased by 65.9%. In 2020, approximately 1 in every 38,465 girls born was named Cailin. FALLING Recent data shows the name is currently falling.