Fewer than five US girls were named Rosia in 2025, so it does not appear in that year’s SSA list for girls. Its best rank for girls was #541, reached in 1910. The most girls given the name in a single year was 102, in 1925. For comparison, it was unranked (under five girls) in 2015 and #1,221 in 1950.
Social Security card records list Rosia in 104 years of the 146 from 1880 to 2025, starting in 1880 with 8 babies. In all, 3,506 US babies have been given the name, all of them girls. Its busiest decade was the 1920s, with 733 babies named Rosia.
In none of the 10 years from 2016 to 2025 were five or more US girls named Rosia.
Related spellings in the SSA files include Rosie (86,026 babies since 1880), Rocio (13,762 babies since 1880), Rossie (2,586 babies since 1880) and Rosio (2,493 babies since 1880). Rarer spellings such as Russia and Roziya are summarised on this page.