Kellen is a distinctive boys' name in United States, ranking #732 in 1999 with 223 recorded births. This places Kellen in the top 6% of ranked US boys' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 2012 with 932 births ranking #337. In 1999, approximately 1 in every 8,610 boys born was named Kellen. FALLING Recent data shows the name is currently falling.