Cássio

given name · Latin script

Meaning: a male given name, equivalent to English Cassius

Recorded as a male name· opposite-gender records fall within measured source noise

/kasiu/(machine-generated) pronunciation, model-generated

Cássio is a given name written in the Latin script, with more bearers in Brazil than in any other country.

rarermore common
  • BRBrazil1 in 4K(measured from records)
  • USUnited States1 in 1.3M
  • PTPortugal≈1 in 95K

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)

52,975 people, 2022

Sources
187 (measured from records)

Highest-authority source

1 in 4.0K (inferred from the name graph)

Brazil

measured from records inferred from the name graph

Name dossier (print, CSV)

Spellings & scripts(measured from records)

One other spelling is counted as the same name:

Locally spelled Cassio in BR Brazil, US United States, PT Portugal and 3 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)

a male given name, equivalent to English Cassius

Sources 1

  • kaikki.org Wiktionary extract (IPA + transliterations)

Attested across 24 languages in the etymology graph.

Where in the world(measured from records)

Cássio 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.

Where Cássio is recorded, by country
CountryMost common spellingSources
BR Brazil#52952,9751 in 4K53KCassio187
US United States—2661 in 1.3M438Cassio154
AO Angola—≈250 est.≈1 in 130K—Cassio10
PT Portugal—≈110 est.≈1 in 95KlistedCassio17
IT Italy—≈79 est.≈1 in 789K1Cassio24
UY Uruguay—201 in 169K20Cassio6
GY Guyana—31 in 250K3——

52,975 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); Census Bureau — First Name Frequency 2020 by sex; Census Bureau — Surname Frequency 2010; 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); 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).

Other names spelled this way(inferred from the name graph)

Cássio is also recorded as 4 other names, grouped separately because the records behind them do not connect to the one described above.

  • a separate name2 spellings in the group

    Also written Cassio

  • English given name7 spellings in the group

    Most recorded in United States, Brazil, Germany, Australia

    Languages: English, German

    Also written Cassio, Càssio

  • Italian given name2 spellings in the group

    Most recorded in Italy, United States

    Also written Cassio

  • Russian surname16 spellings in the group

    Most recorded in Russia

    Also written Касио, Cassio, Kasio, Kassio, Кассио

30 further groups record this spelling and are not listed here.

Grouping is the name graph's, not a register's: two spellings join a group when the evidence links them, so a group is a claim about the records rather than about the people.

Notable people with this name(measured from records)

196019802000Cássio Motta, b. 1960Cássio Gabus Mendes, b. 1961Cássio Alves de Barros, b. 1970Cássio van den Berg, b. 1971Cássio Reis, b. 1977Lincoln, b. 1979Cássio Vargas, b. 1983Cássio Ramos, b. 1987Cássio Magalhaes Fernandes, b. 1987Joelinton, b. 1996

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)

InformalOlá Cássio,Hi Cássio, (English)

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 9 sources across 6 countries.

Official registers attesting Cássio
CountryRegisterYearCountRank
BR BrazilIBGE — Nomes (census name API)—53K#747
PT PortugalIRN — Lista de Nomes Próprios admitidos———

Reference works 2

  • 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 Cássio mean, and where does it come from?
a male given name, equivalent to English Cassius Recorded by kaikki.org Wiktionary extract (IPA + transliterations).
How do you pronounce Cássio?
A machine transcription gives /kasiu/ (IPA) for Portuguese.
Is Cássio a male or female name?
Cássio 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 Cássio have the most bearers?
In Brazil, the national register counted about 53 thousand people named Cássio, more than in any other country we hold, where it is most often spelled cassio.
Where is Cássio most common?
Cássio is densest in Brazil, where the national register counts about 1 in 4.0 thousand people carrying it.
How common is the name Cássio?
In Brazil, the national register counted 52,975 people named Cássio in 2022, about 1 in 4.0 thousand residents.
How common is Cássio compared with other names?
In Brazil, Cássio is the 529th most common given name of 474,894 given names recorded there.

What do you want to know about Cássio?

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Query this name via API
curl -H "X-API-Key: YOUR_KEY" https://api.mondonomo.ai/api/v1/name-graph/c%C3%A1ssio

The 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, “Cássio” — the 529th most common given name in Brazil. Data snapshot 2026-10-10.

See how Cássio parses inside a full name →