Sebastiao
given name · Latin script
Recorded as a male name· opposite-gender records fall within measured source noise
/sɛbɐʃtiɐu/(machine-generated) pronunciation, model-generated
Sebastiao is a given name written in the Latin script, with more bearers in Brazil than in any other country, where it is the 74th most common given name. Recorded meaning: pers. name, Portuguese.
- BRBrazil1 in 615(measured from records)
- PTPortugal≈1 in 12K
- MZMozambique≈1 in 3.2K
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)
- Sources
- 157 (measured from records)
- 1 in 615 (inferred from the name graph)
344,228 people, 2022
Highest-authority source
Brazil
measured from records inferred from the name graph
Meaning & origin(inferred from the name graph)
pers. name, Portuguese
Attested across 12 languages in the etymology graph.
Where in the world(measured from records)
Sebastiao 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 | #74 | 344,228 | 1 in 615 | 463K | Sebastiao | 157 |
| MZ Mozambique | #36 | ≈9,300 est. | ≈1 in 3.2K | 3 | Sebastiao | 21 |
| AO Angola | #64 | ≈8,000 est. | ≈1 in 4.1K | 2 | Sebastiao | 40 |
| PT Portugal | #397 | ≈870 est. | ≈1 in 12K | listed | Sebastiao | 75 |
| ZA South Africa | — | ≈470 est. | ≈1 in 121K | — | Sebastiao | 13 |
| PY Paraguay | — | ≈86 est. | ≈1 in 84K | — | Sebastiao | 4 |
344,228 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); IBGE — Nomes (census name API); Wikidata humans by citizenship — given & family names; Wikidata humans by citizenship — given & family names. 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)
Attested in 40 sources across 23 countries.
| Country | Register | Year | Count | Rank |
|---|---|---|---|---|
| BR Brazil | IBGE — Nomes (census name API) | — | 463K | #88 |
| BR Brazil | Brasil.IO genero-nomes (IBGE Censo 2010 mirror, CC-BY-SA) | — | 461K | #35 |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 2022 | 344K | — |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 2020 | 344K | — |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | — | 343K | #79 |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 2010 | 342K | — |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 2000 | 337K | — |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1990 | 326K | — |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1980 | 301K | — |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1970 | 251K | — |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 1960 | 162K | — |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | 1950 | 91K | — |
Reference works 3
- Dictionary of American Family Names
- Nederlandse FamilienamenBank (Dutch surname bank; ex-Meertens Instituut, now CBG)2007
- Wikidata name items (native-script + romanized given/family names)
These works list the name; their figures are licensed and are not reproduced here.
Register rows as of the 2026-10-09 data build.
Frequently asked questions
- How do you pronounce Sebastiao?
- A machine transcription gives /sɛbɐʃtiɐu/ (IPA) for Portuguese.
- What does the name Sebastiao mean?
- Recorded meaning: pers. name, Portuguese
- Is Sebastiao a male or female name?
- Sebastiao is a male name in our records. Opposite-gender entries fall within the cross-gender noise we measure in the source data, so we don't report them as usage.
- In which country does Sebastiao have the most bearers?
- In Brazil, the national register counted about 344 thousand people named Sebastiao, more than in any other country we hold, where it is most often spelled sebastiao.
- Where is Sebastiao most common?
- Sebastiao is densest in Brazil, where the national register counts about 1 in 615 people carrying it.
- How common is the name Sebastiao?
- In Brazil, the national register counted 344,228 people named Sebastiao in 2022, about 1 in 615 residents.
- How common is Sebastiao compared with other names?
- In Brazil, Sebastiao is the 74th most common given name of 474,894 given names recorded there.
What do you want to know about Sebastiao?
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/sebastiaoThe 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, “Sebastiao” — the 74th most common given name in Brazil. Data snapshot 2026-10-10.