In 2025, 79 US girls were named Isobel, making it the 2,307th most common girls’ name of the year, up 29 places from #2,336 in 2024. That is 0 more than the 79 girls named Isobel in 2024. Its best rank for girls was #817, reached in 1916. The most girls given the name in a single year was 129, in 2016. For comparison, it was #2,098 in 2015 and #5,612 in 1950.
Social Security card records list Isobel in 103 years of the 146 from 1880 to 2025, starting in 1894 with 5 babies. In all, 3,802 US babies have been given the name, all of them girls. Its busiest decade was the 2010s, with 981 babies named Isobel.
Over the 10 years from 2016 to 2025, 944 US girls were named Isobel; the busiest of those years was 2016, with 129. In 2025 that was about 1 in 20,345 of the girls in SSA’s list for the year.
Among the states, Isobel ranked highest in California in 2025, at #1,880 for girls there. It was not in the top 100 of any state. Related spellings in the SSA files include Isabel (133,977 babies since 1880), Isabell (15,279 babies since 1880) and Izabel (3,814 babies since 1880).