In 2025, 258 US boys were named Issac, making it the 915th most common boys’ name of the year, down 68 places from #847 in 2024. That is 29 fewer than the 287 boys named Issac in 2024. Its best rank for boys was #376, reached in 2008. That year also had the most boys given the name: 820. For comparison, it was #562 in 2015 and #817 in 1950.
Social Security card records list Issac in every one of the 146 years from 1880 to 2025; in 1880 there were 16 babies with the name. In all, 24,571 US babies have been given the name, 0.1% of them girls and 99.9% boys. Its busiest decade was the 2000s, with 6,790 babies named Issac.
Over the 10 years from 2016 to 2025, 3,916 US boys were named Issac; the busiest of those years was 2018, with 487. In 2025 that was about 1 in 6,620 of the boys in SSA’s list for the year.
Among the states, Issac ranked highest in Arkansas in 2025, at #370 for boys there. It was not in the top 100 of any state. Related spellings in the SSA files include Isaac (332,292 babies since 1880), Isaak (4,271 babies since 1880), Isac (3,203 babies since 1880) and Izaac (2,845 babies since 1880). Rarer spellings such as Izsak are summarised on this page.