Cailen is a distinctive boys' name in United States, ranking #7610 in 2004 with 9 recorded births. This places Cailen in the bottom 42% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2007 with 17 births ranking #5238. Since 1996, the popularity has increased by 28.6%. In 2004, approximately 1 in every 220,534 boys born was named Cailen. RISING Recent data shows the name is currently rising.