In 2025, 873 US girls were named Sydney, making it the 348th most common girls’ name of the year, down 60 places from #288 in 2024. That is 231 fewer than the 1,104 girls named Sydney in 2024. Its best rank for girls was #23, reached in 2002. The most girls given the name in a single year was 10,243, in 2000. For comparison, it was #122 in 2015 and #595 in 1950.
Social Security card records list Sydney in every one of the 146 years from 1880 to 2025; in 1880 there were 12 babies with the name. In all, 187,700 US babies have been given the name, 95% of them girls and 5.0% boys. Its busiest decade was the 2000s, with 77,288 babies named Sydney.
Over the 10 years from 2016 to 2025, 14,253 US girls were named Sydney; the busiest of those years was 2016, with 2,322. In 2025 that was about 1 in 1,841 of the girls in SSA’s list for the year.
Among the states, Sydney ranked highest in District of Columbia in 2025, at #90 for girls there. It was in the top 100 in 1 state (counting DC). Related spellings in the SSA files include Sidney (108,987 babies since 1880), Sydnee (8,255 babies since 1880), Sydni (5,361 babies since 1880) and Sydnie (5,187 babies since 1880). Rarer spellings such as Cydnee, Cidney and Sidnee are summarised on this page. The open nickname list we use links it to Sid.