Len is a distinctive boys' name in United States, ranking #6916 in 2015 with 12 recorded births. This places Len in the top 49% 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 2015, approximately 1 in every 159,688 boys born was named Len. FALLING Recent data shows the name is currently falling.