Rēx
surname · Latin script
Rēx is a surname written in the Latin script, with more bearers in China than in any other country. Recorded meaning: From the Latin rēx (“king”), referring originally to rabbits of the Belgian "castorrex" breed, so named because their fur was similar to that of beavers. Entered English around 1920.
- PHPhilippines≈1 in 1.8K(inferred from the name graph)
- NZNew Zealand≈1 in 3.3K
- SGSingapore≈1 in 5.6K
carrying the name, as counted by its national register where one exists and as Mondonomo estimates it elsewhere (marked ≈ and "est." on hover). One hue, darker where it is more common; hover a country for its figure.
- China (inferred from the name graph)
- Sources
- 476 (measured from records)
- ≈1 in 1.8K (inferred from the name graph)
≈190,000 people, est.
Highest-authority source
Philippines, est.
measured from records inferred from the name graph
Spellings & scripts(measured from records)
One other spelling is counted as the same name:
Locally spelled Rex in US United States, PH Philippines, GB United Kingdom and 6 more.
Spellings marked ● are how people bearing the name write it in our records, and ○ marks a model's transliteration; click a spelling to open its page.
Meaning & origin(measured from records)
From the Latin rēx (“king”), referring originally to rabbits of the Belgian "castorrex" breed, so named because their fur was similar to that of beavers. Entered English around 1920. Doublet of rajah and roy.
Sources 5
- A concise dictionary of first names
- DUDEN Lexikon der Vornamen
- 국립국어원 외래어 표기 용례 자료 (NIKL loanword/foreign-name transcription examples)
- Wiktionary
- Nordic Names
Attested across 22 languages in the etymology graph.
Where in the world(measured from records)
Rēx counted together with the spellings and other-language forms grouped with it. Where a register counted another spelling, the row names it.
Sorted by bearers: national registers' counts, and Mondonomo's estimates (≈, est.) where no register counts.
| Country | Most common spelling | Sources | ||||
|---|---|---|---|---|---|---|
| CN China | — | ≈190,000 est. | ≈1 in 7.3K | — | Rex | 38 |
| PH Philippines | #367 | ≈59,000 est. | ≈1 in 1.8K | — | Rex | 125 |
| US United States | #820 | 36,166 | 1 in 9.2K | 36K | Rex | 476 |
| NG Nigeria | — | ≈12,000 est. | ≈1 in 18K | — | Rex | 74 |
| GB United Kingdom | #870 | ≈5,700 est. | ≈1 in 11K | 9 | Rex | 189 |
| AU Australia | #747 | ≈3,700 est. | ≈1 in 7K | 9 | Rex | 180 |
| HK Hong Kong | #720 | ≈2,100 est. | ≈1 in 3.4K | — | Rex | 45 |
| NZ New Zealand | #320 | ≈1,500 est. | ≈1 in 3.3K | 11 | Rex | 105 |
| SG Singapore | #476 | ≈1,100 est. | ≈1 in 5.6K | — | Rex | 48 |
Exact figures are national registers' own counts, while figures marked ≈ and est. are Mondonomo’s estimates, counted from our sources and calibrated against those registers; hover one for how far to trust it in that country. A dash means neither exists.
Registers cited: Census Bureau — First Name Frequency 2020 by sex; NRS — Baby names Scotland full list (1974–present); Australian national given names (aggregated state BDM); DIA — Baby name popularity (1900–present). Figures without a register are Mondonomo estimates; see Methodology.
Country figures for a list of names, at full precision, are available under licence rather than by scraping this table (how that works).
Evidence(measured from records)
No register attests this spelling yet
Frequently asked questions
- What does the name Rēx mean, and where does it come from?
- From the Latin rēx (“king”), referring originally to rabbits of the Belgian "castorrex" breed, so named because their fur was similar to that of beavers. Entered English around 1920. Recorded by A concise dictionary of first names and DUDEN Lexikon der Vornamen and 3 other sources.
- In which country does Rēx have the most bearers?
- Mondonomo estimates about 191 thousand people named Rēx in China, more than in any other country we hold, where it is most often spelled rex.
- How common is the name Rēx?
- In the United States, the national register counted 36,166 people named Rēx in 2020, about 1 in 9.2 thousand residents.
- How common is Rēx compared with other names?
- In New Zealand, Rēx is the 320th most common given name of 26,737 given names recorded there.
What do you want to know about Rēx?
Nobody replies to these one by one, but what readers ask decides what these pages answer next.
Query this name via API
curl -H "X-API-Key: YOUR_KEY" https://api.mondonomo.ai/api/v1/name-graph/r%C4%93xThe same payload this page is built from: spellings and scripts, countries and languages, related names, and the registers that attest the form. It takes a free API key (1,000 requests a day), and bulk access is licensed separately.
About this data
measured from records inferred from the name graph machine-generated
These figures come from the data snapshot of and will change as it is rebuilt.
Statistics are aggregated from the Mondonomo name corpus; related names and etymology are inferred from the name graph; pronunciation and any machine-marked transliterations are model-generated. Read how the numbers are made, including their known failure modes, and where the data comes from.
Reference works we consult — surname dictionaries, official name registers, Wikidata and Wiktionary — are named directly, beside the claims they support. The per-country source counts also include datasets of person records: we publish how many there are and their authority tier, but not their names.
Cite this page Mondonomo, “Rēx” — the 320th most common given name in New Zealand. Data snapshot 2026-10-10.