Given name & surname
Caius
“one who rejoices”
Caius is used as a given name and a surname. One Latin interpretation is “one who rejoices.”
Original LatinGaius
Meaning & origin
What it means
One Latin interpretation is “one who rejoices.”
Where it comes from
An origin associated with this spelling is Latin.
The story
Published U.S. birth records include this spelling as early as 1994. This is the earliest published observation available here, rather than a date for the name’s origin.
From dated birth records
Caius through the years
- Babies since 1880
- 2,329
- 2,329 boys · 0 girls
- Most popular year
- 2025
- 254 babies
- 2025
- 254
- #927 for boys
- 2021–25 vs 2016–20
- +29%
- Rising
Where it’s given
By the numbers
In 2025, this name appeared in 254 U.S. birth records for boys, ranking No. 927 among boys’ names. Average annual use for boys was 29.4% higher in 2021–2025 than in 2016–2020. In 2025, California had the largest reported state-level birth count for boys with this name (30). Published U.S. population figures for this spelling include 1,208 as a first name in 2020.
From Social Security birth records and U.S. Census name counts for this exact spelling. Other spellings are counted separately.
Caius’s family of names
In Latin usage, Caius has a feminine form in Caia. Caius has a related form in Cai. Caius has a related form in Caio.
Inner ring: spellings · middle: nicknames and forms · outer: across languages.
Around the world
Caius has relatives in 4 languages. Lines run from its Latin roots to each of them.
Nicknames & forms 4
Diminutives, pet forms, short forms and variants used alongside the name.
Spellings & scripts 2
The same name written differently, including transliterations into other scripts.
Across languages 3
Equivalents and cognates in other languages, plus older forms it grew from.
People named Caius
- Pope Caiuspope of the Catholic Church from 283 to 296
- Caius WelckerDutch footballer (1885-1939)
- Caius Gabriel CibberBritish artist (1630–1700)
- Caius IacobRomanian politician and mathematician (1912-1992)
Listed by how widely each person is written about, which says nothing about the name itself.
Similar names
If you love Caius, these share its style, era, origin or sound, from outside its own family.
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“one who makes carriages”
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