Kailen is a distinctive girls' name in United States, ranking #3684 in 1998 with 32 recorded births. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 77.8%. In 1998, approximately 1 in every 55,215 girls born was named Kailen. FALLING Recent data shows the name is currently falling.