Cassimiro
surname · Latin script
Recorded as a male name· opposite-gender records fall within measured source noise
/kasimiɾu/(machine-generated) pronunciation, model-generated
Cassimiro is a surname written in the Latin script, with more bearers in Brazil than in any other country.
- BRBrazil≈1 in 11K(inferred from the name graph)
- PTPortugal≈1 in 202K
- ESSpain1 in 1.9M
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 (inferred from the name graph)
- Sources
- 106 (measured from records)
- ≈1 in 11K (inferred from the name graph)
≈19,000 people, est.
Highest-authority source
Brazil, est.
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)
Cassimiro 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 | #468 | ≈19,000 est. | ≈1 in 11K | 2.7K | Cassimiro | 106 |
| PT Portugal | — | ≈51 est. | ≈1 in 202K | — | Cassimiro | 11 |
| US United States | — | ≈40 est. | ≈1 in 8.2M | listed | Cassimiro | 49 |
| ES Spain | — | 27 | 1 in 1.9M | 27 | Cassimiro | 11 |
| FR France | — | ≈13 est. | ≈1 in 5.4M | — | Cassimiro | 1 |
| NL Netherlands | — | ≈8 est. | ≈1 in 2.1M | — | Cassimiro | 4 |
| BE Belgium | — | ≈6 est. | ≈1 in 2.1M | — | Cassimiro | 6 |
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 — Nomes (census name API); the us-wru-surnames-voterfile register; INE — Padrón per-token widgets (current living counts, given + apellidos); INE — Apellidos más frecuentes (Padrón Municipal). 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)
Evidence(measured from records)
Attested in 8 sources across 4 countries.
| Country | Register | Year | Count | Rank |
|---|---|---|---|---|
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | — | 26K | #667 |
| ES Spain | INE — Apellidos más frecuentes (Padrón Municipal) | — | 27 | #68,140 |
| ES Spain | INE — Padrón per-token widgets (current living counts, given + apellidos) | — | 27 | #67,696 |
| US United States | wru Name Dictionary — US surnames, voter-file supplement (Khanna et al.) | — | — | — |
Register rows as of the 2026-10-09 data build.
Frequently asked questions
- How do you pronounce Cassimiro?
- A machine transcription gives /kasimiɾu/ (IPA) for Portuguese.
- In which country does Cassimiro have the most bearers?
- Mondonomo estimates about 19 thousand people named Cassimiro in Brazil, more than in any other country we hold, where it is most often spelled cassimiro.
- How common is the name Cassimiro?
- In Spain, the national register counted 27 people named Cassimiro, about 1 in 1.9 million residents.
- How common is Cassimiro compared with other names?
- In Brazil, Cassimiro is the 468th most common surname of 424,864 surnames recorded there.
What do you want to know about Cassimiro?
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/cassimiroThe 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, “Cassimiro” — the 468th most common surname in Brazil. Data snapshot 2026-10-10.