Sibling names for Sidney
Names that sound like they belong in the same family as Sidney usually share its era. These sister and brother names rose and fell on a similar curve to Sidney, whose busiest decade was the 1920s, and are about as common, so neither child's name will feel dated or unusual next to the other.
Sister names for Sidney
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Elvira | #1,715 | 408 | 1920s | |
| Louise | famous in battle (feminine of Louis) | #516 | 2,577 | 1920s |
| Eugenia | "well-born" | #2,787 | 263 | 1920s |
| Adele | noble (from Germanic adal) | #751 | 1,733 | 1920s |
| Winifred | #923 | 1,262 | 1920s | |
| Olga | Russian form of Helga; "holy" | #3,201 | 263 | 1920s |
| Marie | #618 | 2,399 | 1920s | |
| Verna | #3,513 | 158 | 1920s | |
| Eunice | "good victory" | #2,362 | 466 | 1920s |
Brother names for Sidney
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Louis | famous in battle | #249 | 7,243 | 1920s |
| Chester | Roman fort (place name) | #1,588 | 467 | 1920s |
| Clement | #2,262 | 299 | 1920s | |
| Edmund | "wealth" + "protection" | #1,082 | 913 | 1920s |
| Alfred | elf counsel | #840 | 1,380 | 1920s |
| Ervin | #1,656 | 452 | 1920s | |
| Clyde | #743 | 1,827 | 1920s | |
| Milton | mill town or middle town | #1,440 | 670 | 1920s |
| Herman | army man, warrior | #2,368 | 265 | 1920s |
| Maurice | Moorish, dark-skinned | #1,020 | 1,205 | 1920s |
Sidney's era
Sidney ranked #1,327 for boys in 2025, against #1,088 in 2015. Its best year was 1912, at #80. Names that rose and fell with it share its period feel, which keeps the set consistent.
Timeless names that go with any sibling
These names have been used steadily for a hundred years, so they sit comfortably next to a name from any era, Sidney included.
Girls: Elizabeth, Maria, Lydia, Cecilia, Julia, Miriam. Boys: Anthony, Vincent, Calvin, Victor, Oscar, Clayton.
Same era, but close to Sidney
These names follow Sidney's curve too, but we left them out above because they share a first letter or an ending with Sidney. Some parents like that echo; if you do, start here.
- Sylvester same first letter as Sidney
How these were chosen
Each suggestion's share of US babies has followed a curve close to Sidney's since 1880, and its recent number of babies is within about twelve times Sidney's, so the names are in the same league. Names starting with the same letter as Sidney or with the same ending are left out, so the names go together without matching. Spellings of Sidney itself are excluded.