Rex dog name
We found 3,955 dogs named Rex in the public pet registers of 29 places. Combining all places, Rex is the #87 dog name. Almost all dogs named Rex are male.
🐱 Rex is also a cat name (#314 for cats, 24 cats).
Rex as a dog name, by place
| Place | Rank | Dogs | Years |
|---|---|---|---|
| Sweden Sweden | #60 in top 100 | 1,916 | 2025 |
| Allegheny County United States | #122 of 51,228 | 537 | 2003–2026 |
| New York City United States | #84 of 34,500 | 497 | 2014–2025 |
| South Australia Australia | #88 in top 100 | 631 | 2025 |
| Toronto Canada | #70 of 10,500 | 97 | 2019 |
| Seattle United States | #175 of 8,191 | 22 | 2026 |
| Playford Australia | #30 of 4,586 | 67 | 2015 |
| Cambridge United States | #122 of 4,375 | 14 | 2017–2026 |
| Vancouver Canada | #64 of 4,602 | 21 | 1999–2026 |
| Zurich Switzerland | #186 of 5,788 | 6 | 2025 |
| Noosa Australia | #104 of 3,045 | 16 | 2017 |
| Laval Canada | #79 of 2,965 | 15 | 2017–2026 |
| Worcester United States | #156 of 2,906 | 7 | 2026 |
| Maple Ridge Canada | #126 of 2,440 | 8 | 2026 |
| Basel Switzerland | #219 of 3,446 | 4 | 2026 |
| Victoria Canada | #251 of 2,588 | 4 | 2025 |
| Surf Coast Shire Australia | #49 of 1,974 | 17 | 2016 |
| Golden Plains Shire Australia | #23 of 2,062 | 23 | 2016 |
| Burnside Australia | #71 of 1,888 | 11 | 2015 |
| Framingham United States | #133 of 1,965 | 5 | 2020 |
| Richmond United States | #107 of 2,347 | 5 | 2018 |
| Tacoma United States | #170 of 1,917 | 3 | 2021 |
| Corangamite Shire Australia | #33 of 1,161 | 11 | 2023 |
| Port Moody Canada | #126 of 1,280 | 3 | 2019 |
| Miranda Colombia | #66 of 758 | 4 | 2024 |
| Villavicencio Colombia | #115 of 717 | 2 | 2026 |
| Adelaide Australia | #49 of 958 | 4 | 2014 |
| Prospect Australia | #88 of 518 | 2 | 2016 |
| Nariño (municipality) Colombia | #43 of 353 | 3 | 2020 |
Rank among all names in that place's register ("in top N" where only a top list is published). "Per 10,000" is how many of every 10,000 registered dogs there are named Rex. Click a column to sort. See data sources.
Female or male?
20 female and 1,214 male dogs named Rex, in the places that record sex.
Rex over the years
Dogs named Rex per 10,000 dogs, by the year of registration or licence (varies by place). Hover a bar for the number.
Breeds of dogs named Rex
Compared to all dogs, Rex is especially common among Kelpies (4.4×), Vizslas (2.9×), Dobermans (2.8×), German Shepherds (2.4×) and Australian Cattle Dogs (2.2×).
Based on 1,142 dogs named Rex with a known breed. Crosses are counted as their first-named breed.
Famous dogs named Rex
From Wikidata. More famous dogs
Rex as a baby name
Rex was the #859 boys' name in the US in 2025 (281 babies). Elsewhere it ranks #228 for boys in England and Wales, #394 for boys in New Zealand and #647 for boys in Scotland. See Rex as a baby name on MixedName, including which languages use it.
Similar dog names
Dog names ranked near Rex
Top dog names · All dog names starting with R · Rex as a cat name