Len is a distinctive boys' name in United States, ranking #9377 in 2025 with 8 recorded births. The name reached its all-time peak in 2014 with 15 births ranking #5890. Since 1996, the popularity has decreased by 38.5%. In 2025, approximately 1 in every 213,510 boys born was named Len. FALLING Recent data shows the name is currently falling.