Kailen is a distinctive girls' name in United States, ranking #3880 in 2007 with 41 recorded births. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 127.8%. In 2007, approximately 1 in every 46,889 girls born was named Kailen. FALLING Recent data shows the name is currently falling.