Onesia
given name · Latin script
A female name· listed as female by the registers that count names by sex
(measured from records)Officially recorded in 3 countries · latest register: Guyana, 2025
/ɔnɛziɐ/(machine-generated) pronunciation, model-generated
Onesia is a female given name written in the Latin script, with more bearers in Brazil than in any other country.
- BRBrazil1 in 377K(measured from records)
- GYGuyana1 in 83K
- NINicaragua≈1 in 929K
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.
- Brazil (measured from records)
- Record sources
- 30 (measured from records)
- 1 in 83K (inferred from the name graph)
562 people, 2022
corpus datasets behind its best-documented spelling
strongest: highest-authority source
Guyana
measured from records inferred from the name graph
Meaning & origin
No verified etymology recorded for this name yet — the entries below are drawn from usage statistics and the name graph.
Where in the world
(measured from records)Onesia 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 | |||
|---|---|---|---|---|---|
| BR Brazil | 562 | 1 in 377K | 841 | Onesia | 30 |
| US United States | ≈50 est. | ≈1 in 6.6M | — | Onesia | 14 |
| GY Guyana | 9 | 1 in 83K | 9 | — | — |
| NI Nicaragua | ≈7 est. | ≈1 in 929K | — | Onesia | 4 |
| PT Portugal | ≈4 est. | ≈1 in 2.7M | listed | — | 1 |
562 people counted by IBGE — names by decade (Kaggle mirror), 2022. 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: IBGE — names by decade (Kaggle mirror); Brasil.IO genero-nomes (IBGE Censo 2010 mirror, CC-BY-SA); Guyana — Official List of Electors July 2025. 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).
How to address them
(machine-generated)A formal English salutation is built on the surname, so it needs a full name — on its own, a first name only supports the informal form.
Evidence
(measured from records)6 registers and reference works attest this spelling, across 3 countries.
| Country | Register | Year | Count | Rank |
|---|---|---|---|---|
| BR Brazil | Brasil.IO genero-nomes (IBGE Censo 2010 mirror, CC-BY-SA) | — | 841 | #5,166 |
| BR Brazil | IBGE — Nomes (census name API) | — | 830 | #10,365 |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 2022 | 562 | — |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | — | 558 | #12,337 |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1980 | 533 | — |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1970 | 471 | — |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1960 | 370 | — |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1950 | 217 | — |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | 1950 | 153 | — |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | 1940 | 138 | — |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | 1960 | 101 | — |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1940 | 79 | — |
Register rows as of the 2026-10-09 data build.
Frequently asked questions
- How do you pronounce Onesia?
- A machine transcription gives /ɔnɛziɐ/ (IPA) for Portuguese.
- Is Onesia a male or female name?
- Onesia is a female name. National registers that list it by sex list it as female: Brazil (Brasil.IO genero-nomes (IBGE Censo 2010 mirror, CC-BY-SA)).
- In which country does Onesia have the most bearers?
- In Brazil, the national register counted about 562 people named Onesia, more than in any other country we hold, where it is most often spelled onesia.
- Where is Onesia most common?
- Measured as a share of residents rather than as a count, Onesia is densest in Guyana — about 1 in 83 thousand people — even though Brazil holds more of our records for it.
- How common is the name Onesia?
- In Brazil, the national register counted 562 people named Onesia in 2022, about 1 in 377 thousand residents.
What do you want to know about Onesia?
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/onesiaThe 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, “Onesia”. Data snapshot 2026-10-13.