In 2025, 591 US boys were named Leonidas, making it the 510th most common boys’ name of the year, the same rank as in 2024. That is 6 fewer than the 597 boys named Leonidas in 2024. Its best rank for boys was #421, reached in 2022. That year also had the most boys given the name: 760. For comparison, it was #518 in 2015 and #2,694 in 1950.
Social Security card records list Leonidas in 121 years of the 146 from 1880 to 2025, starting in 1880 with 5 babies. In all, 10,281 US babies have been given the name, all of them boys. Its busiest decade was the 2010s, with 4,479 babies named Leonidas.
Over the 10 years from 2016 to 2025, 6,275 US boys were named Leonidas; the busiest of those years was 2022, with 760. In 2025 that was about 1 in 2,890 of the boys in SSA’s list for the year.
Among the states, Leonidas ranked highest in Hawaii in 2025, at #197 for boys there. It was not in the top 100 of any state. Related spellings in the SSA files include Leo (262,124 babies since 1880), Leon (184,074 babies since 1880), Leone (6,637 babies since 1880) and Lev (3,083 babies since 1880). Rarer spellings such as Leonides, Leonidus and Leonida are summarised on this page. The open nickname list we use links it to Lee and Leon.