Kailen is a distinctive girls' name in United States, ranking #4760 in 2001 with 25 recorded births. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 38.9%. In 2001, approximately 1 in every 72,022 girls born was named Kailen. FALLING Recent data shows the name is currently falling.