Len is a distinctive boys' name in United States, ranking #6193 in 2012 with 14 recorded births. This places Len in the top 43% 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 2012, approximately 1 in every 135,473 boys born was named Len. FALLING Recent data shows the name is currently falling.