Cailin is a distinctive girls' name in United States, ranking #5485 in 2016 with 24 recorded births. The name reached its all-time peak in 2003 with 164 births ranking #1274. Since 1996, the popularity has decreased by 80.5%. In 2016, approximately 1 in every 73,812 girls born was named Cailin. FALLING Recent data shows the name is currently falling.