In 2025, 8 US boys were named Len, making it the 9,377th most common boys’ name of the year, up 134 places from #9,511 in 2024. That is 0 more than the 8 boys named Len in 2024. Its best rank for boys was #514, reached in 1885. The most boys given the name in a single year was 121, in 1960. For comparison, it was #6,918 in 2015 and #841 in 1950.
Social Security card records list Len in 142 years of the 146 from 1880 to 2025, starting in 1880 with 7 babies. In all, 4,616 US babies have been given the name, 2.2% of them girls and 98% boys. Its busiest decade was the 1960s, with 926 babies named Len.
Over the 10 years from 2016 to 2025, 90 US boys were named Len; the busiest of those years was 2023, with 12. In 2025 that was about 1 in 213,510 of the boys in SSA’s list for the year.
Related spellings in the SSA files include Lenny (9,035 babies since 1880), Lynn (234,778 babies since 1880), Leon (184,074 babies since 1880) and Leann (24,363 babies since 1880).