Cailin is a distinctive girls' name in United States, ranking #1971 in 2011 with 100 recorded births. This places Cailin in the top 10% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2003 with 164 births ranking #1274. Since 1996, the popularity has decreased by 18.7%. In 2011, approximately 1 in every 17,588 girls born was named Cailin. FALLING Recent data shows the name is currently falling.