Cailin is a distinctive girls' name in United States, ranking #5989 in 2021 with 20 recorded births. The name reached its all-time peak in 2003 with 164 births ranking #1274. Since 1996, the popularity has decreased by 83.7%. In 2021, approximately 1 in every 81,986 girls born was named Cailin. FALLING Recent data shows the name is currently falling.