Cailin is a distinctive boys' name in United States, ranking #8579 in 2002 with 7 recorded births. The name reached its all-time peak in 1998 with 7 births ranking #7670. Since 1996, the popularity has increased by 16.7%. In 2002, approximately 1 in every 277,353 boys born was named Cailin. FALLING Recent data shows the name is currently falling.