Kellen is a distinctive boys' name in United States, ranking #521 in 2005 with 471 recorded births. The name reached its all-time peak in 2012 with 932 births ranking #337. Since 1996, the popularity has increased by 127.5%. In 2005, approximately 1 in every 4,240 boys born was named Kellen. FALLING Recent data shows the name is currently falling.