Rj
loc · Latin script
Meaning: initialism of Rio de Janeiro: a state of Brazil
Recorded as a male name· opposite-gender records fall within measured source noise
Rj is a name written in the Latin script, with more bearers in the United States than in any other country.
- PHPhilippines≈1 in 25K(inferred from the name graph)
- CACanada≈1 in 73K
- USUnited States≈1 in 76K
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.
- United States (inferred from the name graph)
- Sources
- 364 (measured from records)
- ≈1 in 25K (inferred from the name graph)
≈4,400 people, est.
Highest-authority source
Philippines, est.
measured from records inferred from the name graph
Spellings & scripts(measured from records)
Locally spelled R-J in PH Philippines, CA Canada.
Meaning & origin(measured from records)
initialism of Rio de Janeiro: a state of Brazil
Sources 1
- kaikki.org Wiktionary extract (IPA + transliterations)
Where in the world(measured from records)
Rj 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 | |||
|---|---|---|---|---|---|
| US United States | ≈4,400 est. | ≈1 in 76K | 24 | Rj | 364 |
| PH Philippines | ≈4,400 est. | ≈1 in 25K | — | R-J | 85 |
| CA Canada | ≈520 est. | ≈1 in 73K | 1 | R-J | 105 |
| GB United Kingdom | ≈400 est. | ≈1 in 167K | listed | Rj | 99 |
| IT Italy | ≈380 est. | ≈1 in 163K | — | Rj | 11 |
| AU Australia | ≈190 est. | ≈1 in 135K | 1 | — | 66 |
| GA Gabon | ≈21 est. | ≈1 in 108K | 1 | — | — |
| NL Netherlands | 16 | 1 in 1.1M | 9 | Rj | 30 |
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: Meertens NVB — Nederlandse Voornamenbank (all-time BRP bearer counts, 2018); SSA — National Baby Names (1880–present); Alberta Open Government — Frequency and Ranking of Baby Names by Year and Gender; Ministere de l'Interieur — 2025 candidate lists (local + legislative); SA BDM — Popular baby names South Australia (1944–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).
Other recorded senses(measured from records)
Rj is also recorded in 2 other lexicons, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.
In Khmer, ^uP/ independent vowel repre- seating the Sanskrit and Pali vowel; (see; ^ or ^.) sn 7*^ok/ p. to reproach, to scold; t. check! (in chess), {a.w.: to check (the king in chess); c hess (the game). sHfiJHll!! to checkmate snrfil
as a wordHeadley, Cambodian-English Dictionary, Volume II (ម-អ)
Jovian radius: a unit of measurement, equal to the radius of Jupiter.
as a wordkaikki.org Wiktionary extract (IPA + transliterations)
Ordered by how much of this spelling's record each language holds, so a sense from a language the name is barely used in sits last rather than first.
Evidence(measured from records)
Attested in 11 sources across 9 countries.
| Country | Register | Year | Count | Rank |
|---|---|---|---|---|
| GA Gabon | Ministere de l'Interieur — 2025 candidate lists (local + legislative) | 2025 | 1 | #94 |
Register rows as of the 2026-10-09 data build.
Frequently asked questions
- What does the name Rj mean, and where does it come from?
- initialism of Rio de Janeiro: a state of Brazil Recorded by kaikki.org Wiktionary extract (IPA + transliterations).
- In which country does Rj have the most bearers?
- Mondonomo estimates about 4.4 thousand people named Rj in the United States, more than in any other country we hold, where it is most often spelled rj.
- How common is the name Rj?
- In the Netherlands, the national register counted 16 people named Rj, about 1 in 1.1 million residents.
What do you want to know about Rj?
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/rjThe 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), which returns what this page shows everyone; the full country table, every register citation and the year-by-year series come with a licensed key, as does bulk access.
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, “Rj”. Data snapshot 2026-10-10.