Kellen is a distinctive boys' name in United States, ranking #799 in 1998 with 192 recorded births. This places Kellen in the top 7% 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 1998, approximately 1 in every 9,955 boys born was named Kellen. FALLING Recent data shows the name is currently falling.