Fewer than five US girls were named Seirra in 2025, so it does not appear in that year’s SSA list for girls. Its best rank for girls was #2,362, reached in 1998. The most girls given the name in a single year was 63, in 1999. For comparison, it was unranked (under five girls) in 2015 and unranked in 1950.
Social Security card records list Seirra in 29 years of the 146 from 1880 to 2025, starting in 1985 with 22 babies. In all, 887 US babies have been given the name, all of them girls. Its busiest decade was the 1990s, with 417 babies named Seirra.
In none of the 10 years from 2016 to 2025 were five or more US girls named Seirra.
Related spellings in the SSA files include Sierra (100,866 babies since 1880), Siera (2,543 babies since 1880), Siara (2,132 babies since 1880) and Sera (1,616 babies since 1880). Rarer spellings such as Seairra are summarised on this page.