Caio
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Meaning
“Portuguese form of the Roman name Gaius, of disputed origin, traditionally linked to Latin gaudere, to rejoice; short, bright, and one of Brazil's favorite boys' names of the last generation”
How popular is Caio around the world?
In the United States, Caio is on the Social Security birth record for 2020 to 2025. In England and Wales, 36 boys named Caio were born in 2025, the 873rd most common name among boys that year.
Caio is on the official records of the United States, England and Wales, Austria, Argentina and Spain.
United States
on record
In the United States, Caio is on the Social Security birth record for 2020 to 2025.
Shape drawn from US Social Security baby-name records. Caio has stayed rare in US records the whole time: no peak decade to name.
Births with a Social Security record. Source: U.S. Social Security Administration
England and Wales
1 in 16,000
In England and Wales, 36 boys named Caio were born in 2025, the 873rd most common name among boys that year.
share of that year’s name registrations
Birth registrations in England and Wales (not the whole UK); exact spellings are counted separately, and any spelling under 3 in a year is withheld at source. Source: Office for National Statistics, baby names in England and Wales
Austria
1 in 76,000
In Austria, 1 boy named Caio was born in 2025, ranked 1,842nd among boys that year, spellings that differ only by special characters counted together.
The count never rose above 3 in a year, too few to chart.
Live births in Austria by year of birth, 1984–2025, from Statistik Austria’s first-name statistics; spellings that differ only by special characters are counted together (umlauts stay apart), every name down to a single birth is published, and the count covers babies with Austrian citizenship only until 2009, every baby from 2010, and from 2015 also births abroad to mothers living in Austria. Shares divide by Statistik Austria’s count of live births from 2010, and before that by the file’s own total for the year. Source: Statistik Austria - data.statistik.gv.at (OGDEXT_VORNAMEN_1, updated 2026-07-09)
Argentina
1 in 170,000
In Argentina, 4 newborns were given the name Caio in 2024.
share of that year’s name registrations
Given-name components of births in Argentina 2012–2024; national cells are lower bounds and no sex split is published. Source: RENAPER (Argentina), Dirección Nacional de Población, given names 2012-2024
Spain
1 in 260,000
In Spain, 175 residents are named Caio, ranked 5,161st among men, with a mean age of 26.5 years.
Residents of Spain on 1 January 2025. Spain publishes how old a name’s living bearers are, not a birth series, so there is no year chart. Source: INE (Spain), Censo de Población anual, 1 January 2025
Canada
last on record 2022
Caio is not on the 2024 record for Canada, where names under 5 in a year are excluded at source.
share of that year’s name registrations
First given names from provincial and territorial vital statistics across Canada; any name-sex-year under 5 is excluded at source, and small Quebec counts carry a randomized adjustment made at source. Shares divide by Statistics Canada’s count of live births for the year; the 2024 count is preliminary. Source: Statistics Canada, first names at birth (table 17-10-0147-01)
Ireland
last on record 2024
Caio is not on the 2025 record for Ireland, where names under 3 in a year are withheld at source.
The count never rose above 6 in a year, too few to chart.
Exact registered spellings from Irish vital statistics; any name under 3 in a year is withheld at source, and accented spellings (fadas) are recorded reliably only from 2018. Source: Central Statistics Office (Ireland), Irish babies' names
Montevideo City
last on record 2010
Caio is not on the 2011 record for Montevideo, whose registry withholds nothing, so the spelling was not given there that year.
The count never rose above 5 in a year, too few to chart.
Births in the department of Montevideo (not all of Uruguay) by first name and year of birth, 1940–2011, from the city’s civil registry, which writes names in capitals, almost always without accents; counted as spelling groups (accent and punctuation variants merged), nothing is withheld at source, and 2012 is excluded as a partial year. Source: Servicio de Registro Civil, Intendencia de Montevideo, Partidas de Registro Civil de Montevideo (Licencia de Datos Abiertos - Uruguay); 2012 dropped as partial
Not on the record in Mexico City, Puerto Rico, New Zealand, Scotland and Poland: those registries withhold small counts, so rare uses may sit below their floors.
Not on the Chile record: nametree keeps spellings that reached 5 registrations in some year, so rarer uses are not shown. Not on the France record: nametree keeps spellings that reached 20 births in some year, so rarer uses are not shown. Not on the South Australia record for 1944 to 2017: that registry withholds nothing, so this spelling was not given there in those years. Not on Norway’s list: Statistics Norway lists only first names carried by 200 or more living people, so rarer names are not shown.
Keep exploring
The Caio deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Caio truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Caio fits with your family’s names and surname.
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