Keithen is a distinctive boys' name in United States, ranking #8391 in 2015 with 9 recorded births. The name reached its all-time peak in 2006 with 21 births ranking #4434. Since 1996, the popularity has decreased by 25.0%. In 2015, approximately 1 in every 212,918 boys born was named Keithen. FALLING Recent data shows the name is currently falling.