Kailen is a distinctive girls' name in United States, ranking #4990 in 2002 with 24 recorded births. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 33.3%. In 2002, approximately 1 in every 74,868 girls born was named Kailen. FALLING Recent data shows the name is currently falling.