Kellen is a distinctive boys' name in United States, ranking #511 in 2007 with 519 recorded births. The name reached its all-time peak in 2012 with 932 births ranking #337. Since 1996, the popularity has increased by 150.7%. In 2007, approximately 1 in every 3,999 boys born was named Kellen. FALLING Recent data shows the name is currently falling.