In 2025, 69 US girls were named Lennie, making it the 2,557th most common girls’ name of the year, up 591 places from #3,148 in 2024. That is 18 more than the 51 girls named Lennie in 2024. Its best rank for girls was #354, reached in 1884. The most girls given the name in a single year was 123, in 1915. For comparison, it was #10,557 in 2015 and #1,400 in 1950.
In 2025, 8 US boys were named Lennie, making it the 9,378th most common boys’ name of the year, up 2,413 places from #11,791 in 2024. That is 2 more than the 6 boys named Lennie in 2024. Its best rank for boys was #701, reached in 1889. The most boys given the name in a single year was 82, in 1957. For comparison, it was #13,252 in 2015 and #1,246 in 1950.
Social Security card records list Lennie in 142 years of the 146 from 1880 to 2025, starting in 1880 with 11 babies. In all, 7,725 US babies have been given the name, 63% of them girls and 37% boys. Its busiest decade was the 1910s, with 1,029 babies named Lennie.
Over the 10 years from 2016 to 2025, 325 US girls were named Lennie; the busiest of those years was 2025, with 69. In 2025 that was about 1 in 23,294 of the girls in SSA’s list for the year.
Among the states, Lennie ranked highest in Utah in 2025, at #517 for girls there. It was not in the top 100 of any state. Related spellings in the SSA files include Lenny (9,035 babies since 1880), Leni (1,962 babies since 1880), Linnie (8,709 babies since 1880) and Leonie (2,231 babies since 1880). Rarer spellings such as Leonia are summarised on this page.