Kailen is a distinctive girls' name in United States, ranking #5350 in 2005 with 24 recorded births. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 33.3%. In 2005, approximately 1 in every 76,987 girls born was named Kailen. FALLING Recent data shows the name is currently falling.