Cailin is a distinctive girls' name in United States, ranking #1274 in 2003 with 164 recorded births. The name reached its all-time peak in 2003 with 164 births ranking #1274. Since 1996, the popularity has increased by 33.3%. In 2003, approximately 1 in every 11,141 girls born was named Cailin. FALLING Recent data shows the name is currently falling.