Caio
Caio was the 3322nd most popular name for boys in 2025, given to 35 babies. Its best year was 2023, when it ranked 3067th with 40 babies. Over the last ten years it has moved up 989 places. More babies were named Caio in the 2010s than in any other decade.
Meaning Not yet researched how we research meanings
- Rank in 2025
- #3,322 boys, up 838 places since 2020
- Babies in 2025
- 35boys
- Girls and boys
- Almost always a boy’s name2021–2025
- Peak year
- 202340 babies
- Total since 1880
- 722babies recorded
Caio popularity since 1880
| Year | Rank (boys) | Babies (boys) |
|---|---|---|
| 2025 | #3,322 | 35 |
| 2020 | #4,160 | 24 |
| 2010 | #3,545 | 30 |
| 2000 | #5,968 | 11 |
| 1990 | #7,298 | 6 |
| 1980 | — | — |
| 1970 | — | — |
| 1960 | — | — |
| 1950 | — | — |
| 1940 | — | — |
| 1930 | — | — |
| 1920 | — | — |
| 1910 | — | — |
| 1900 | — | — |
| 1890 | — | — |
| 1880 | — | — |
How popular is Caio, counting every spelling?
Caio is the most common spelling of a name family that had 76 boys in 2025 across its spellings. Together these spellings went to 76 boys in 2025.
| Spelling | Babies 2025 | Official rank | Babies 2021–2025 |
|---|---|---|---|
| Caio | 35 | #3,322 | 166 |
| Kaio | 22 | #4,619 | 110 |
| Kaeo | 8 | #9,289 | 67 |
| Kayo | 11 | #7,433 | 63 |
Spellings count together when they sound the same in American English and are used for the same sex; nicknames and forms that sound different (such as Theo and Theodore) are kept apart. How we group spellings.
How many kids will share the name Caio?
35 of the 3,606,400 babies born in the US in 2025 were named Caio (0.01 per 1,000 births). For a boy named Caio born in 2025, the chance that another child with the same name is in a class of 20 children the same age is under 1 in 50. If every grade liked the name as much as the 2025 babies do, only about one elementary school in 240 (of 430 pupils) would have a child named Caio.
Shares of all registered births (NCHS); classes assumed to be children born the same year. How we estimate this.
How old are people named Caio?
About 700 people born in the US named Caio are alive today, with a median age of 13; half are between 6 and 20. That makes Caio mostly worn by children and young adults.
Babies given the name each year (SSA) times the share of that birth year still alive (SSA life tables). Counts people born in the US only. Method.
Caio by state
How common Caio was among boys born in each state in 2021–2025. It is notably more common than nationally in California (1.8×). In 48 states fewer than five boys a year got the name, too few for SSA to publish, so those states show as zero.
Names with a similar history
These names rose and fell in step with Caio: their share of US boys followed the most similar curve since 1880. If you like Caio, they share its era and feel.
Questions about the name Caio
How popular is the name Caio?
Caio was the 3322nd most popular name for boys in 2025, given to 35 babies. Its best year was 2023, when it ranked 3067th with 40 babies. Over the last ten years it has moved up 989 places. More babies were named Caio in the 2010s than in any other decade.
Is Caio a boy or girl name?
In 2021–2025, almost always a boy’s name given the name Caio in the US.
Where is Caio most popular?
In 2021–2025, Caio was most common in Massachusetts (0.04 per 1,000 boys), followed by California and Florida.