Sibling names for Theodore
Names that sound like they belong in the same family as Theodore usually share its era. These sister and brother names rose and fell on a similar curve to Theodore, whose busiest decade was the 2020s, and are about as common, so neither child's name will feel dated or unusual next to the other.
Sister names for Theodore
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Violet | the violet flower | #13 | 32,903 | 2010s |
| Eloise | #49 | 16,070 | 2020s | |
| Cecilia | from the Caecilius family (perhaps 'blind') | #108 | 10,913 | 2010s |
| Adeline | noble | #59 | 16,287 | 2010s |
| Naomi | my pleasantness | #47 | 22,545 | 2010s |
| Lila | #187 | 7,248 | 2010s | |
| Charlotte | feminine form of Charles | #2 | 64,955 | 2010s |
| Georgia | farmer (feminine of George) | #99 | 10,756 | 1920s |
| Vivian | alive, lively | #72 | 14,635 | 1920s |
| Ruby | ruby (the red gemstone) | #64 | 17,671 | 1920s |
| Genevieve | #148 | 9,171 | 1920s |
Brother names for Theodore
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Everett | boar-strong (from Everard) | #77 | 20,465 | 2010s |
| Leo | lion | #19 | 40,252 | 2020s |
| Felix | happy, lucky | #175 | 9,986 | 2010s |
| Emmett | little Emma (probably) | #121 | 16,023 | 2010s |
| Jasper | treasurer (Persian) | #129 | 14,304 | 2010s |
| Jack | #15 | 44,439 | 1920s | |
| Wesley | western meadow (surname) | #52 | 24,179 | 2010s |
| Max | greatest (short form of Maximilian) | #180 | 11,155 | 2010s |
| August | venerable, majestic | #81 | 17,891 | 2020s |
| Calvin | little bald one | #132 | 12,884 | 1950s |
| Louis | famous in battle | #249 | 7,243 | 1920s |
| Joseph | 'God will add / increase' | #29 | 37,848 | 1980s |
Theodore's era
Theodore ranked #4 for boys in 2025, against #99 in 2015. Its best year was 2024, at #4. A sibling name from the same wave will sound like it was chosen by the same parents; a name from an older or newer wave can make one child's name feel dated next to the other's.
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, Theodore included.
Girls: Elizabeth, Maria, Lydia, Cecilia, Julia, Miriam. Boys: Samuel, Anthony, Wesley, Vincent, Calvin, Oscar.
Same era, but close to Theodore
These names follow Theodore's curve too, but we left them out above because they share a first letter or an ending with Theodore. Some parents like that echo; if you do, start here.
- Eleanor same ending as Theodore
How these were chosen
Each suggestion's share of US babies has followed a curve close to Theodore's since 1880, and its recent number of babies is within about twelve times Theodore's, so the names are in the same league. Names starting with the same letter as Theodore or with the same ending are left out, so the names go together without matching. Spellings of Theodore itself are excluded.