Cailin is a distinctive girls' name in United States, ranking #1467 in 2005 with 144 recorded births. The name reached its all-time peak in 2003 with 164 births ranking #1274. Since 1996, the popularity has increased by 17.1%. In 2005, approximately 1 in every 12,831 girls born was named Cailin. FALLING Recent data shows the name is currently falling.