Kailen is a distinctive girls' name in United States, ranking #6216 in 2012 with 21 recorded births. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 16.7%. In 2012, approximately 1 in every 83,845 girls born was named Kailen. FALLING Recent data shows the name is currently falling.