Sibling names for Sydney
Names that sound like they belong in the same family as Sydney usually share its era. These sister and brother names rose and fell on a similar curve to Sydney, whose busiest decade was the 2000s, and are about as common, so neither child's name will feel dated or unusual next to the other.
Sister names for Sydney
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Destiny | destiny, fate | #635 | 3,408 | 2000s |
| Mikayla | who is like God? (variant of Michaela) | #748 | 2,137 | 2000s |
| Cassidy | curly-haired (Irish Ó Caiside) | #541 | 3,140 | 2000s |
| Alexis | defender, helper | #554 | 3,673 | 2000s |
| Brianna | #222 | 8,244 | 2000s | |
| Katelyn | variant of Caitlin (Catherine) | #1,077 | 1,511 | 1990s |
| Madison | son of Matthew (or of Maud) | #40 | 26,176 | 2000s |
| Kyra | #830 | 2,032 | 2000s | |
| Gabrielle | man of God; God is my strength (feminine of Gabriel) | #633 | 2,876 | 1990s |
| Mackenzie | son of Coinneach (Kenneth) | #228 | 8,924 | 2000s |
| Hannah | grace, favor | #56 | 21,258 | 1990s |
Brother names for Sydney
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Brendan | prince (Welsh word, via Irish) | #1,098 | 1,275 | 1990s |
| Jakob | form of Jacob | #1,372 | 1,023 | 2000s |
| Collin | pet form of Nicholas (variant of Colin) | #493 | 3,237 | 2000s |
| Jalen | #443 | 3,237 | 2000s | |
| Tanner | tanner (leather worker) | #475 | 3,765 | 1990s |
| Chandler | candle maker or seller (English surname) | #753 | 1,981 | 1990s |
| Cristian | Christian | #362 | 5,055 | 2000s |
| Zackary | #1,513 | 757 | 1990s | |
| Trenton | Trent's town | #1,042 | 1,508 | 2000s |
| Dalton | valley settlement | #448 | 3,153 | 1990s |
| Hunter | hunter (surname) | #130 | 16,555 | 2000s |
Sydney's era
Sydney ranked #348 for girls in 2025, against #122 in 2015. Its best year was 1999, at #23. 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, Sydney included.
Girls: Elizabeth, Maria, Lydia, Cecilia, Julia, Miriam. Boys: Anthony, Vincent, Calvin, Victor, Oscar, Clayton.
Same era, but close to Sydney
These names follow Sydney's curve too, but we left them out above because they share a first letter or an ending with Sydney. Some parents like that echo; if you do, start here.
How these were chosen
Each suggestion's share of US babies has followed a curve close to Sydney's since 1880, and its recent number of babies is within about twelve times Sydney's, so the names are in the same league. Names starting with the same letter as Sydney or with the same ending are left out, so the names go together without matching. Spellings of Sydney itself are excluded.