Fewer than five US girls were named Nan in 2025, so it does not appear in that year’s SSA list for girls. Its best rank for girls was #341, reached in 1883. The most girls given the name in a single year was 255, in 1947. For comparison, it was unranked (under five girls) in 2015 and #592 in 1950.
Social Security card records list Nan in 123 years of the 146 from 1880 to 2025, starting in 1880 with 16 babies. In all, 10,274 US babies have been given the name, all of them girls. Its busiest decade was the 1950s, with 2,181 babies named Nan.
Over the 10 years from 2016 to 2025, 6 US girls were named Nan; the busiest of those years was 2022, with 6.
Related spellings in the SSA files include Nancy (1,007,393 babies since 1880) and Nana (3,396 babies since 1880). Rarer spellings such as Nayan, Nain and Nahun are summarised on this page.