In 2025, 186 US boys were named Isai, making it the 1,139th most common boys’ name of the year, down 76 places from #1,063 in 2024. That is 19 fewer than the 205 boys named Isai in 2024. Its best rank for boys was #701, reached in 2007. That year also had the most boys given the name: 333. For comparison, it was #1,031 in 2015 and unranked in 1950.
Social Security card records list Isai in 53 years of the 146 from 1880 to 2025, starting in 1966 with 6 babies. In all, 7,385 US babies have been given the name, 0.6% of them girls and 99% boys. Its busiest decade was the 2000s, with 2,633 babies named Isai.
Over the 10 years from 2016 to 2025, 1,859 US boys were named Isai; the busiest of those years was 2019, with 207. In 2025 that was about 1 in 9,183 of the boys in SSA’s list for the year.
Among the states, Isai ranked highest in Wisconsin in 2025, at #726 for boys there. It was not in the top 100 of any state. Related spellings in the SSA files include Isaiah (254,710 babies since 1880), Isa (6,575 babies since 1880), Issa (3,217 babies since 1880) and Esau (2,976 babies since 1880). Rarer spellings such as Iza, Eisa and Isao are summarised on this page.