Kailen is a distinctive girls' name in United States, ranking #4473 in 2000 with 27 recorded births. This places Kailen in the top 25% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2007 with 41 births ranking #3880. Since 1996, the popularity has increased by 50.0%. In 2000, approximately 1 in every 67,258 girls born was named Kailen. FALLING Recent data shows the name is currently falling.