Cailin is a distinctive girls' name in United States, ranking #1416 in 2004 with 147 recorded births. The name reached its all-time peak in 2003 with 164 births ranking #1274. Since 1996, the popularity has increased by 19.5%. In 2004, approximately 1 in every 12,491 girls born was named Cailin. FALLING Recent data shows the name is currently falling.