Sibling names for Rex
Names that sound like they belong in the same family as Rex usually share its era. These sister and brother names rose and fell on a similar curve to Rex, whose busiest decade was the 1950s, and are about as common, so neither child's name will feel dated or unusual next to the other.
Sister names for Rex
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Anne | grace, favor (from Hannah) | #619 | 2,473 | 1950s |
| Mona | Irish "noble"; other origins too | #2,806 | 423 | 1950s |
| Sylvia | of the forest | #300 | 4,002 | 1950s |
| Twila | #3,512 | 171 | 1950s | |
| Nadine | from Nadia; "hope" | #1,627 | 681 | 1950s |
| Jeanette | little Jean (Jane) | #2,391 | 336 | 1930s |
| Loretta | #606 | 1,925 | 1930s | |
| Gwendolyn | white or blessed ring (Welsh) | #360 | 4,062 | 1950s |
Brother names for Rex
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Glenn | valley (Gaelic) | #1,443 | 625 | 1950s |
| Jerome | sacred name | #1,257 | 859 | 1950s |
| Carlton | "settlement of free peasants" | #2,893 | 229 | 1950s |
| Philip | fond of horses | #528 | 3,055 | 1950s |
| Gerard | "spear" + "strong" | #1,713 | 589 | 1950s |
| Alan | #191 | 10,204 | 1950s | |
| Wendell | from the tribal name Wendel | #2,165 | 422 | 1950s |
| Lawrence | from Laurentum; associated with laurel | #520 | 2,724 | 1950s |
| Alfonso | "noble" + "ready" | #1,012 | 1,215 | 1990s |
| Stuart | "steward" | #2,534 | 251 | 1950s |
| Myron | "myrrh, perfume" | #1,650 | 476 | 1950s |
Rex's era
Rex ranked #859 for boys in 2025, against #680 in 2015. Its best year was 1951, at #170. 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, Rex included.
Girls: Elizabeth, Maria, Lydia, Cecilia, Julia, Miriam. Boys: Samuel, Anthony, Wesley, Vincent, Calvin, Victor.
Same era, but close to Rex
These names follow Rex's curve too, but we left them out above because they share a first letter or an ending with Rex. 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 Rex's since 1880, and its recent number of babies is within about twelve times Rex's, so the names are in the same league. Names starting with the same letter as Rex or with the same ending are left out, so the names go together without matching. Spellings of Rex itself are excluded.