Kellen is a distinctive boys' name in United States, ranking #680 in 2002 with 270 recorded births. The name reached its all-time peak in 2012 with 932 births ranking #337. Since 1996, the popularity has increased by 30.4%. In 2002, approximately 1 in every 7,191 boys born was named Kellen. FALLING Recent data shows the name is currently falling.