Caius
given name · Portuguese · Latin script
Recorded as a male name· opposite-gender records fall within measured source noise
Caius is a given name, with more bearers in Brazil than in any other country. It appears chiefly in Portuguese and English, written in the Latin script. Recorded meaning: Ellipsis of Gonville and Caius College, Cambridge.
- BRBrazil1 in 739◐
- BOBolivia1 in 1.9K
- PEPeru1 in 6.7K
carrying the name, one hue, darker where it is more common. Hover a country for its figure.
- ≈289K ●
- #809 ●
- 2 ●
- Sources
- 230 ●
- 1 in 739 ◐
across 6 countries
of 16M given names
recorded for this name
206K records
Official registry-verified
Brazil
Spellings & scripts●
One other spelling is counted as the same name:
Locally spelled Caio in BR Brazil, US United States, GB United Kingdom and 7 more, Cayo in AR Argentina, PE Peru, CL Chile and 6 more, Gaius in NG Nigeria, SG Singapore, BE Belgium and Cajus in DE Germany.
Spellings marked ● are how people bearing the name write it in our records; ○ marks a model's transliteration. Click a spelling to open its page.
Meaning & origin●
Ellipsis of Gonville and Caius College, Cambridge.
Sources 1
- kaikki.org Wiktionary extract (IPA + transliterations)
Attested across 21 languages in the etymology graph.
Where in the world●
Sorted by bearers counted by national registers, records where none counts.
| Country | Most common spelling | Sources | |||||
|---|---|---|---|---|---|---|---|
| BR Brazil | #154 | 286,597△ | 116K rec. | 1 in 739 | 287K | Caio | 230 |
| AR Argentina | — | 40,822 | 27K rec. | — | 7K | Cayo | 53 |
| PE Peru | — | 36,060 | 43K rec. | — | — | Cayo | 65 |
| CL Chile | — | 4,350 | 592 rec. | — | 1 | Cayo | 50 |
| BO Bolivia | — | 3,280 | 2.4K rec. | — | — | Cayo | 29 |
| EC Ecuador | — | 1,680 | 54 rec. | — | 32 | Cayo | 20 |
| US United States | — | 1,299 | 7.2K rec. | 1 in 256K | 1.3K | Caio | 194 |
| NG Nigeria | — | 1,168 | 2.1K rec. | — | — | Gaius | 44 |
| MX Mexico | — | 1,080 | 1.2K rec. | — | — | Cayo | 33 |
| GB United Kingdom | — | 728 | 495 rec. | — | 3 | Caio | 58 |
| PT Portugal | #739 | 712 | 237 rec. | — | listed | Caio | 69 |
| CA Canada | — | 615 | 192 rec. | — | 5 | Caius | 36 |
Roughly 287K people in Brazil bear this name (about 1 in 739). Estimates project the name's share of our records onto national population, so each is only as good as the record base beside it — the Basis column gives that base; rows marked △ rest on fewer records than the estimate itself and are order-of-magnitude at best.
Country figures for a list of names, at full precision, are available under licence rather than by scraping this table. How that works.
Languages●
- Portuguese1.9K33%
- English1.7K29%
- Finnish73313%
- German2675%
- Romanian2274%
Show as table
| Name | Records | Note |
|---|---|---|
| Portuguese | 1,874 | 33% |
| English | 1,687 | 29% |
| Finnish | 733 | 13% |
| German | 267 | 5% |
| Romanian | 227 | 4% |
Language is read off each record's context, not declared by the bearer; a share is of all records for this spelling.
Other recorded senses●
Caius is also recorded in 3 other lexicons, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.
In English, Gonville and Caius College,
as a namePronouncing Dictionary of Proper Names
In English, Cambridge University
as a namePronouncing Dictionary of Proper Names
In Latin, alternative form of Gāius
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.
Over time●
Show as table
| Year | records |
|---|---|
| 1994 | 5 |
| 1999 | 7 |
| 2000 | 10 |
| 2001 | 16 |
| 2002 | 13 |
| 2003 | 15 |
| 2004 | 14 |
| 2005 | 23 |
| 2006 | 15 |
| 2007 | 29 |
| 2008 | 27 |
| 2009 | 43 |
| 2010 | 49 |
| 2011 | 44 |
| 2012 | 74 |
| 2013 | 109 |
| 2014 | 124 |
| 2015 | 138 |
| 2016 | 153 |
| 2017 | 110 |
| 2018 | 130 |
| 2019 | 137 |
| 2020 | 156 |
| 2021 | 138 |
| 2022 | 150 |
| 2023 | 140 |
| 2024 | 206 |
| 2025 | 254 |
US SSA — National Baby Names (1880–present) — 28 years between 1994–2025. One register's own figures, never a sum across registers: two registers counting the same people would double them.
Notable people with this name●
- Caius of Koreab. 1571JPKorean Catholic layman, Japanese Martyr (1571-1624)
- Caius Gabriel Cibberb. 1630DEBritish artist (1630–1700)
- Caius Brediceanub. 1879RORomanian politician
- Caius Welckerb. 1885NLDutch footballer (1885-1939)
- Caius Parellada i Cardellachb. 1911ESSpanish jurist, historian and lawyer
- Caius Iacobb. 1912RORomanian politician and mathematician (1912-1992)
- Caius Spronkenb. 1958NLDutch painter and sculptor
- Caius Dobrescub. 1966RORomanian writer and literary critic
- Caius Lungub. 1989ROfootballer
- CaiusITpope of the Catholic Church from 283 to 296
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).
Evidence●
Attested in 41 sources across 23 countries.
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 2026-09-12 data build · 141 rows in the corpus for this spelling.
Frequently asked questions
- How common is the name Caius?
- We estimate roughly 289 thousand people bear Caius (counting its spellings and scripts) across 6 countries in our records.
- In which country does Caius have the most bearers?
- We estimate about 287 thousand people bear Caius in Brazil, more than in any other country in our records, where it is most often spelled caio.
- Where is Caius most common?
- Caius is densest in Brazil, where the national register counts about 1 in 739 people carrying it.
- How common is Caius compared with other names?
- In Brazil, Caius is the 154th most common given name of 536,280 given names recorded there.
- Is Caius a male or female name?
- Caius 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 does the name Caius mean?
- Recorded meaning: Ellipsis of Gonville and Caius College, Cambridge.
Query this name via API
curl https://api.mondonomo.ai/api/v1/name-graph/caiusThe same payload this page is built from: spellings and scripts, countries and languages, related names, and the registers that attest the form. Rate-limited for casual use. Bulk access and licensing.
About this data
Data snapshot . Figures are rebuilt periodically and will change.
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, “Caius” — the 154th most common given name in Brazil. Data snapshot 2026-09-12.