Cailin is a distinctive girls' name in United States, ranking #4674 in 2019 with 29 recorded births. The name reached its all-time peak in 2003 with 164 births ranking #1274. Since 1996, the popularity has decreased by 76.4%. In 2019, approximately 1 in every 57,847 girls born was named Cailin. FALLING Recent data shows the name is currently falling.