2,317births recorded
8Countries
3Variants
1998Peak · Montevideo (Uruguay)
#799Switzerland 2025
Caio is a boy name family recorded 2,317 times in 8 countries since 1938. It ranks highest today in Switzerland (#799 in 2025). Its all-time peak was in Montevideo in 1998, at 18.5 births per 100,000. Elsewhere it is mostly given as Cayo (Argentina).
Popularity by country
Births per 100,000 newborns, all forms of the name combined.
Which form wins where
Births per 100,000 newborns for each form, in the selected country.
All forms of Caio
| Variants | Language | Total births | Country | Latest rank | Peak year | 10-year trend |
|---|---|---|---|---|---|---|
| Caio | Portuguese | 722 | 🇺🇸 United States | #3314 | 2023 | ▲ 71 % |
| Caio | Portuguese | 580 | 🏴 England & Wales | #873 | 2022 | ▲ 64 % |
| Caio | Portuguese | 111 | 🇦🇷 Argentina | – | 2014 | – |
| Caio | Portuguese | 53 | 🇨🇭 Switzerland | #799 | 2022 | new |
| Caio | Portuguese | 32 | 🇩🇪 Germany (large cities) | – | 2020 | – |
| Caio | Portuguese | 10 | 🇫🇷 France | – | 2020 | – |
| Kaio | English | 429 | 🇺🇸 United States | #4539 | 2023 | ▲ 175 % |
| Kaio | English | 71 | 🏴 England & Wales | #1895 | 2025 | new |
| Cayo | Spanish | 252 | 🇦🇷 Argentina | – | 1938 | – |
| Cayo | Spanish | 46 | 🇺🇸 United States | – | 2018 | – |
How we grouped these names
- Caio ↔ Kaio — spelling variant
Questions about Caio
How popular is the name Caio?
In 2025 it ranked #799 in Switzerland. Official registers record 2,317 births across 8 countries.
What is Caio in other languages?
Kaio (English); Cayo (Spanish).
When was Caio most popular?
It peaked in Montevideo in 1998, at 18.5 births per 100,000.
Is Caio a boy or a girl name?
In official birth registers, Caio is a boy name.