Kailen is a distinctive girls' name in United States, ranking #6351 in 2004 with 19 recorded births. This places Kailen in the top 34% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2007 with 41 births ranking #3880. In 2004, approximately 1 in every 96,638 girls born was named Kailen. FALLING Recent data shows the name is currently falling.