Caio
given name · Latin script
Meaning: Viseu (Alagoa)
Recorded as a male name· opposite-gender records fall within measured source noise
/kaju/(machine-generated) pronunciation, model-generated
Caio is a given name written in the Latin script, with more bearers in Brazil than in any other country.
- BRBrazil1 in 739(measured from records)
- USUnited States1 in 254K
- PTPortugal≈1 in 16K
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
- 236 (measured from records)
- 1 in 739 (inferred from the name graph)
286,597 people, 2022
Highest-authority source
Brazil
measured from records inferred from the name graph
Meaning & origin(measured from records)
Viseu (Alagoa)
Sources 1
- Dicionario Sefaradi De SobrenomesDictionary Of Sephardic Surnames Inclusive Cristaos-Novos, Conversos, Marranos, Italianos,…
Attested across 12 languages in the etymology graph.
Where in the world(measured from records)
Caio 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 | #192 | 286,597 | 1 in 739 | 287K | Caio | 236 |
| US United States | — | 1,308 | 1 in 254K | 1.3K | Caio | 216 |
| PT Portugal | #697 | ≈660 est. | ≈1 in 16K | listed | Caio | 69 |
| IT Italy | — | ≈480 est. | ≈1 in 131K | 1 | Caio | 43 |
| FR France | — | ≈350 est. | ≈1 in 196K | — | Caio | 3 |
| CH Switzerland | — | ≈140 est. | ≈1 in 62K | 4 | Caio | 36 |
| UY Uruguay | — | 112 | 1 in 30K | 112 | Caio | 8 |
| PY Paraguay | — | ≈110 est. | ≈1 in 68K | — | Caio | 10 |
286,597 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); Census Bureau — First Name Frequency 2020 by sex; the pt-irn-lista-nomes register; ISTAT — Contanomi newborn per-name series (1999–2024, JSONP backend); INE Uruguay — Nombres más frecuentes 1902–2024 (Tableau Public); BFS — Familiennamen der Wohnbevölkerung (surnames). 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)
Caio is also recorded in 4 other lexicons, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.
[Ignoto]
as a nameIl grande libro dei nomi per bebè. Significato, origini, curiosità. Oltre 7000 nomi per bambine e bambini Significato,…
In Galician, first-person singular present indicative of caer
as a wordkaikki.org Wiktionary extract (IPA + transliterations)
In euq-pro, seagull
as a wordkaikki.org Wiktionary extract (IPA + transliterations)
In Latin, to beat
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.
Notable people with this name(measured from records)
- Caio Júniorb. 1965BRBrazilian association football player and manager (1965–2016)
- Caio Ribeiro Decoussaub. 1975BRBrazilian footballer and manager
- Caio Blatb. 1980BRBrazilian actor
- Caio Canedo Corrêab. 1990BRBrazilian and Emirati association football player
- Caio Bonfimb. 1991BROlympic racewalker
- Caio Lucasb. 1994BREmirati association football player
- Caio Césarb. 1995BRBrazilian association football player
- Caio Henriqueb. 1997BRBrazilian association football player
- Caio Paulistab. 1998BRfootball player
- Caio Pumputisb. 1999BRBrazilian swimmer
The ten people covered by the most Wikipedia language editions — a proxy for cross-cultural notability, which favours historical and Western figures over equally prominent contemporary ones — shown by birth year. Source: Wikidata (CC0).
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 50 sources across 25 countries.
| Country | Register | Year | Count | Rank |
|---|---|---|---|---|
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 2022 | 287K | — |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | — | 285K | #106 |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 2020 | 265K | — |
| BR Brazil | IBGE — Nomes (census name API) | — | 228K | #230 |
| BR Brazil | Brasil.IO genero-nomes (IBGE Censo 2010 mirror, CC-BY-SA) | — | 226K | #69 |
| BR Brazil | IBGE — names by decade (Kaggle mirror) | 2010 | 187K | — |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | 2020 | 22K | — |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | — | 2.1K | #106 |
| BR Brazil | Brasil.IO genero-nomes (IBGE Censo 2010 mirror, CC-BY-SA) | — | 1.9K | #2,887 |
| US United States | Census Bureau — First Name Frequency 2020 by sex | 2020 | 1.3K | #10,267 |
| UY Uruguay | INE Uruguay — Nombres más frecuentes 1902–2024 (Tableau Public) | — | 112 | — |
| UY Uruguay | INE Uruguay — Nombres más frecuentes 1902–2024 (Tableau Public) | — | 109 | — |
Reference works 4
- Dictionary of American Family Names
- Nederlandse FamilienamenBank (Dutch surname bank; ex-Meertens Instituut, now CBG)2007
- Wikipedia given-name tokens
- 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
- What does the name Caio mean, and where does it come from?
- Viseu (Alagoa) Recorded by Dicionario Sefaradi De SobrenomesDictionary Of Sephardic Surnames Inclusive Cristaos-Novos, Conversos, Marranos, Italianos,….
- How do you pronounce Caio?
- A machine transcription gives /kaju/ (IPA) for Portuguese.
- Is Caio a male or female name?
- Caio 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.
- What are other forms of the name Caio?
- In the etymology graph, Kay, Kai and Kaj are forms of the same name in other languages.
- In which country does Caio have the most bearers?
- In Brazil, the national register counted about 287 thousand people named Caio, more than in any other country we hold, where it is most often spelled caio.
- Where is Caio most common?
- Caio is densest in Brazil, where the national register counts about 1 in 739 people carrying it.
- How common is the name Caio?
- In Brazil, the national register counted 286,597 people named Caio in 2022, about 1 in 739 residents.
- How common is Caio compared with other names?
- In Brazil, Caio is the 192nd most common given name of 474,894 given names recorded there.
What do you want to know about Caio?
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/caioThe 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, “Caio” — the 192nd most common given name in Brazil. Data snapshot 2026-10-10.