Keithen is a distinctive boys' name in United States, ranking #5743 in 2005 with 14 recorded births. The name reached its all-time peak in 2006 with 21 births ranking #4434. Since 1996, the popularity has increased by 16.7%. In 2005, approximately 1 in every 142,653 boys born was named Keithen. FALLING Recent data shows the name is currently falling.