How Many People Are Named Caius?
An estimated 2,058 people in the United States have the first name Caius. It is almost exclusively a male name. The average bearer is 9 years old, and Caius peaked in popularity in 2024 with 205 births that year.
Below you will find a full statistical profile of Caius 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 Caius paired with any surname.
Key Insights
- Caius is a modern name. With an average bearer age of just 9, it has gained most of its popularity in recent years.
Estimated Living Americans
2,058
About 1 in 166,547 people in the U.S.
Rarity
Rare
Predicted Gender
Male
100.0% confidence
Average Age
9
years old
Peak Year
2024
205 births
Total Registered
2,074
since 1880
Gender Distribution for Caius
Caius is almost exclusively a male name. Out of 2,074 total births registered, 100.0% were male.
Caius as a male name
Ranked #1,061 in 2024
205 male births in 2024
Peak: 2024 (205 births)
Caius: Popularity Over Time
SSA records for Caius span from the 1990s to the 2020s, covering 4 decades of naming data. The most popular decade for this name was the 2010s, when 1,068 babies were registered. While Caius is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Caius by Decade
How has Caius 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.
Caius by State
Birth registrations for Caius span all 28 states and territories in the SSA database. The highest counts are in California, Texas, New York. The lowest are in Oregon, Kentucky, Kansas. On average, about 35 Caiuss were registered per state.
Caius + Last Name Combinations
How many people share a full name with Caius as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Caius
Other first names starting with C with a similar number of bearers.
Caius: Questions and Answers
How many people in the U.S. are named Caius?
We estimate approximately 2,058 people named Caius 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 166,547 Americans share this first name.
Is Caius a common name?
Caius is classified as "Rare" and is more popular than 93.8% of all first names in the SSA database. A total of 2,074 births have been registered with this name since 1880.
When was Caius most popular?
Caius reached peak popularity in 2024, when 205 babies were given this name. The average age of a living person named Caius is approximately 9 years old, reflecting when the name was most commonly given.
Is Caius a male name?
Caius is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Caius Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Caius Smith, Caius Johnson, Caius 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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