Cailin is a distinctive girls' name in United States, ranking #1315 in 2001 with 146 recorded births. The name reached its all-time peak in 2003 with 164 births ranking #1274. Since 1996, the popularity has increased by 18.7%. In 2001, approximately 1 in every 12,333 girls born was named Cailin. FALLING Recent data shows the name is currently falling.