Len is a distinctive boys' name in United States, ranking #5890 in 2014 with 15 recorded births. This places Len in the top 42% 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. Since 1996, the popularity has increased by 15.4%. In 2014, approximately 1 in every 128,029 boys born was named Len. FALLING Recent data shows the name is currently falling.