Kailen is a distinctive girls' name in United States, ranking #3468 in 1999 with 36 recorded births. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 100.0%. In 1999, approximately 1 in every 49,272 girls born was named Kailen. FALLING Recent data shows the name is currently falling.