In 2025, 44 US boys were named Izaac, making it the 2,856th most common boys’ name of the year, down 244 places from #2,612 in 2024. That is 7 fewer than the 51 boys named Izaac in 2024. Its best rank for boys was #1,192, reached in 2005. The most boys given the name in a single year was 151, in 2009. For comparison, it was #1,363 in 2015 and unranked in 1950.
Social Security card records list Izaac in 43 years of the 146 from 1880 to 2025, starting in 1977 with 7 babies. In all, 2,845 US babies have been given the name, all of them boys. Its busiest decade was the 2010s, with 1,120 babies named Izaac.
Over the 10 years from 2016 to 2025, 636 US boys were named Izaac; the busiest of those years was 2018, with 80. In 2025 that was about 1 in 38,820 of the boys in SSA’s list for the year.
Among the states, Izaac ranked highest in California in 2025, at #1,328 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 Izaak (2,889 babies since 1880).