In 2025, 36 US girls were named Jo, making it the 4,028th most common girls’ name of the year, up 219 places from #4,247 in 2024. That is 2 more than the 34 girls named Jo in 2024. Its best rank for girls was #51, reached in 1947. The most girls given the name in a single year was 8,052, in 1954. For comparison, it was #5,043 in 2015 and #64 in 1950.
In 2025, 8 US boys were named Jo, making it the 9,273rd most common boys’ name of the year, down 1,788 places from #7,485 in 2024. That is 3 fewer than the 11 boys named Jo in 2024. Its best rank for boys was #1,132, reached in 1935. The most boys given the name in a single year was 40, in 1960. For comparison, it was unranked (under five boys) in 2015 and #1,303 in 1950.
Social Security card records list Jo in 144 years of the 146 from 1880 to 2025, starting in 1881 with 5 babies. In all, 180,911 US babies have been given the name, 99% of them girls and 1.0% boys. Its busiest decade was the 1950s, with 64,223 babies named Jo.
Over the 10 years from 2016 to 2025, 378 US girls were named Jo; the busiest of those years was 2023, with 47. In 2025 that was about 1 in 44,646 of the girls in SSA’s list for the year.
Related spellings in the SSA files include Joe (464,574 babies since 1880), Joy (143,324 babies since 1880), Jodi (80,657 babies since 1880) and Joi (6,095 babies since 1880). Rarer spellings such as Jojo are summarised on this page.