Fewer than five US girls were named Rosio in 2025, so it does not appear in that year’s SSA list for girls. Its best rank for girls was #1,150, reached in 1981. That year also had the most girls given the name: 118. For comparison, it was #18,600 in 2015 and unranked in 1950.
Social Security card records list Rosio in 55 years of the 146 from 1880 to 2025, starting in 1963 with 6 babies. In all, 2,493 US babies have been given the name, 99% of them girls and 0.8% boys. Its busiest decade was the 1980s, with 764 babies named Rosio.
Over the 10 years from 2016 to 2025, 10 US girls were named Rosio; the busiest of those years was 2023, with 5.
Related spellings in the SSA files include Rosie (86,026 babies since 1880), Rocio (13,762 babies since 1880), Rosia (3,506 babies since 1880) and Rossie (2,586 babies since 1880).