Girl & boy name
Sidney
As of 2025, Sidney ranks #1872 among American girls' names, according to Social Security records. 105 girls received the name that year. Popularity is fading: #1510 five years ago, #1872 now. SSA records for Sidney go back to 1880; the peak came in 1999 at #258, with 1,218 babies named that year. Geographically, it's strongest in Michigan, where it ranks #965 among girl names.
Rankings
Sidney popularity, 1880–2025
Where Sidney is most popular
Uniqueness score
Distinctive without being unheard of. Based on how many babies per birth were named Sidney in the most recent year of SSA data.
Similar names
Sidney as a boy name
Sidney holds the #1323 spot on the 2025 list of the most popular boy names in the U.S. That amounts to 146 newborn boys in a single year. The name has been cooling off, slipping from #1160 in 2020 to #1323 today. Its strongest year on record was 1912 (#80 nationally, 1,003 newborns), in a data series reaching back to 1880. The name's biggest fan base is in South Carolina (#743 there in 2025).