Kailen is a distinctive girls' name in United States, ranking #4473 in 2000 with 27 recorded births. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 50.0%. In 2000, approximately 1 in every 67,258 girls born was named Kailen. FALLING Recent data shows the name is currently falling.