Len is a distinctive boys' name in United States, ranking #5151 in 1997 with 12 recorded births. This places Len in the top 48% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2014 with 15 births ranking #5890. In 1997, approximately 1 in every 157,091 boys born was named Len. FALLING Recent data shows the name is currently falling.