Keithen is a distinctive boys' name in United States, ranking #4247 in 1999 with 17 recorded births. The name reached its all-time peak in 2006 with 21 births ranking #4434. Since 1996, the popularity has increased by 41.7%. In 1999, approximately 1 in every 112,946 boys born was named Keithen. FALLING Recent data shows the name is currently falling.