Kailen is a distinctive girls' name in United States, ranking #4244 in 2010 with 35 recorded births. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 94.4%. In 2010, approximately 1 in every 50,781 girls born was named Kailen. FALLING Recent data shows the name is currently falling.