Kailen is a distinctive girls' name in United States, ranking #5306 in 1997 with 19 recorded births. This places Kailen in the top 33% 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 1997, approximately 1 in every 91,614 girls born was named Kailen. FALLING Recent data shows the name is currently falling.