In 2025, 15 US boys were named Isadore, making it the 5,963rd most common boys’ name of the year, up 2,636 places from #8,599 in 2024. That is 6 more than the 9 boys named Isadore in 2024. Its best rank for boys was #274, reached in 1913. The most boys given the name in a single year was 273, in 1916. For comparison, it was #7,704 in 2015 and #1,516 in 1950.
Social Security card records list Isadore in 143 years of the 146 from 1880 to 2025, starting in 1880 with 9 babies. In all, 5,909 US babies have been given the name, 3.3% of them girls and 97% boys. Its busiest decade was the 1910s, with 2,045 babies named Isadore.
Over the 10 years from 2016 to 2025, 135 US boys were named Isadore; the busiest of those years was 2021, with 19. In 2025 that was about 1 in 113,872 of the boys in SSA’s list for the year.
Related spellings in the SSA files include Isidore (3,421 babies since 1880). Rarer spellings such as Isidor and Isador are summarised on this page. The open nickname list we use links it to Izzy.