Kailen is a distinctive girls' name in United States, ranking #5018 in 2006 with 28 recorded births. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 55.6%. In 2006, approximately 1 in every 67,895 girls born was named Kailen. FALLING Recent data shows the name is currently falling.