Len is a distinctive boys' name in United States, ranking #7944 in 2007 with 10 recorded births. This places Len in the bottom 45% 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 decreased by 23.1%. In 2007, approximately 1 in every 207,524 boys born was named Len. FALLING Recent data shows the name is currently falling.