In 2025, 13,355 US boys were named Theodore, making it the 4th most common boys’ name of the year, the same rank as in 2024. That is 1,286 more than the 12,069 boys named Theodore in 2024. Its best rank for boys was #4, reached in this year, 2025. That year also had the most boys given the name: 13,355. For comparison, it was #99 in 2015 and #99 in 1950.
Social Security card records list Theodore in every one of the 146 years from 1880 to 2025; in 1880 there were 232 babies with the name. In all, 318,175 US babies have been given the name, 0.3% of them girls and 99.6% boys. Its busiest decade was the 2020s, with 65,647 babies named Theodore.
Over the 10 years from 2016 to 2025, 91,446 US boys were named Theodore; the busiest of those years was 2025, with 13,355. In 2025 that was about 1 in 128 of the boys in SSA’s list for the year.
Among the states, Theodore ranked highest in New Hampshire in 2025, at #1 for boys there. It was in the top 100 in 51 states (counting DC). Related spellings in the SSA files include Theodor (2,216 babies since 1880) and Theadore (4,005 babies since 1880). Rarer spellings such as Teodoro, Thedore and Teodor are summarised on this page. The open nickname list we use links it to Ted, Teddy and Theo.