Len is a distinctive boys' name in United States, ranking #8498 in 2011 with 9 recorded births. The name reached its all-time peak in 2014 with 15 births ranking #5890. Since 1996, the popularity has decreased by 30.8%. In 2011, approximately 1 in every 210,999 boys born was named Len. FALLING Recent data shows the name is currently falling.