How Many People Are Named Caio?
An estimated 680 people in the United States have the first name Caio. It is almost exclusively a male name. The average bearer is 15 years old, and Caio peaked in popularity in 2023 with 40 births that year.
Below you will find a full statistical profile of Caio as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Caio paired with any surname.
Estimated Living Americans
680
About 1 in 504,050 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
15
years old
Peak Year
2023
40 births
Total Registered
687
since 1880
Gender Distribution for Caio
Caio is almost exclusively a male name. Out of 687 total births registered, 100.0% were male.
Caio as a male name
Ranked #3,695 in 2024
30 male births in 2024
Peak: 2023 (40 births)
Caio: Popularity Over Time
SSA records for Caio span from the 1990s to the 2020s, covering 4 decades of naming data. The most popular decade for this name was the 2010s, when 250 babies were registered. While Caio is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Caio by Decade
How has Caio tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Caio by State
Birth registrations for Caio span all 3 states and territories in the SSA database. The highest counts are in Massachusetts, California, Florida. The lowest are in Florida, California, Massachusetts. On average, about 59 Caios were registered per state.
Caio + Last Name Combinations
How many people share a full name with Caio as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Caio
Other first names starting with C with a similar number of bearers.
Caio: Questions and Answers
How many people in the U.S. are named Caio?
We estimate approximately 680 people named Caio are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 504,050 Americans share this first name.
Is Caio a common name?
Caio is classified as "Very Rare" and is more popular than 87.3% of all first names in the SSA database. A total of 687 births have been registered with this name since 1880.
When was Caio most popular?
Caio reached peak popularity in 2023, when 40 babies were given this name. The average age of a living person named Caio is approximately 15 years old, reflecting when the name was most commonly given.
Is Caio a male name?
Caio is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Caio Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Caio Smith, Caio Johnson, Caio Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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