Len is a distinctive boys' name in United States, ranking #7921 in 2016 with 10 recorded births. The name reached its all-time peak in 2014 with 15 births ranking #5890. Since 1996, the popularity has decreased by 23.1%. In 2016, approximately 1 in every 189,721 boys born was named Len. FALLING Recent data shows the name is currently falling.