Kailen is a distinctive girls' name in United States, ranking #3981 in 2003 with 34 recorded births. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 88.9%. In 2003, approximately 1 in every 53,737 girls born was named Kailen. FALLING Recent data shows the name is currently falling.