Cailin is a distinctive boys' name in United States, ranking #12763 in 2009 with 5 recorded births. The name reached its all-time peak in 1998 with 7 births ranking #7670. Since 1996, the popularity has decreased by 16.7%. In 2009, approximately 1 in every 396,661 boys born was named Cailin. FALLING Recent data shows the name is currently falling.