"to rejoice, joyful"
Origin: Latin
Language: Latin
Caius
Does Caius flow with your last name?
The ancient Roman name that Julius Caesar himself bore
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European
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Nicknames
Nicknames for Caius
2 shorthand options for every setting
Meaning & Origin
"earthly, of the earth"
Origin: Etruscan
Language: Latin
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The Story of Caius
Caius is one of the most ancient Roman praenomina (personal names), derived from the Latin root connected to 'gaudere' — to rejoice. In classical Rome, Caius and Gaius were interchangeable spellings of the same name. The name appears throughout Roman history as one of the most common of all personal names, used across every social class from slaves to senators. Most famously, Gaius Julius Caesar bore this name — his full name being Gaius Iulius Caesar — making Caius one of the most historically resonant names in all of Western civilization.
Caius has experienced renewed interest in English-speaking countries as parents seek distinctive classical names beyond more common Roman choices like Marcus or Julius. Its association with Roman antiquity, Shakespearean drama, and Gonville & Caius College at Cambridge (pronounced 'Keys') gives it an air of intellectual distinction.
In ancient Rome, the name Gaius/Caius was so common that Roman legal texts used 'Gaius' as a placeholder — the Roman equivalent of 'John Doe.' Gonville & Caius College, Cambridge — refounded by physician John Caius (pronounced 'Keys') in 1557 — keeps this ancient name alive in one of Britain's most prestigious institutions, famous for its alumni including Stephen Hawking.
Historical Record
Caius first appeared in US Social Security records in 1994.
Over 2,074 babies have been named Caius in the United States since SSA records began.
Today, Caius is a hidden gem — rare but distinctive , currently ranked #1,063 for boy names in the US .
Fun Facts
- Julius Caesar's full given name was Gaius — making Caius the personal name of history's most famous Roman
- In Roman legal texts, 'Gaius' was used like 'John Doe' — a generic placeholder name in legal examples
- Stephen Hawking, Francis Crick, and Tilda Swinton all attended Gonville & Caius College, Cambridge
Caius in Other Languages
Greek
Γάιος
Latin
Caius / Gaius
Italian
Gaio
Spanish
Cayo
Portuguese
Caio
Popularity Over Time
#1,063
Current Rank
Rising
Trend
Hidden Gem
Based on SSA data 1880–present
Year-by-year popularity data will be available soon.
Famous People Named Caius
G
Gaius Julius Caesar
Military
Roman general and statesman who transformed the Roman Republic; his assassination on the Ides of March 44 BC is one of h...
Roman general and statesman who transformed the Roman Republic; his assassination on the Ides of March 44 BC is one of history's most dramatic moments
C
Caius (Volturi) Fictional
Other
Fictional vampire elder of the Volturi coven in Stephenie Meyer's 'Twilight' saga — ruthless, ancient, and powerful
C
Caius Fictional
Other
Character in Shakespeare's 'The Merry Wives of Windsor,' a pompous French doctor who woos the merry Mistress Ford
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See all →Quick Facts
- Gender
- Boy
- Syllables
- 2
- Popularity Rank
- #1,063
- Total SSA Count
- 205
- Cultural Origins
- Roman British European American
- Pronunciation
- Moderate
- Formality
- Formal
- Cross-Cultural Ease
- Moderate
Common Nicknames
Cai
Kai
Middle Name Ideas
Suggested pairings based on syllable flow and style
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Classic pairing, smooth 1-2 syllable flow
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Classic pairing, smooth 1-2 syllable flow
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Timeless choice, American heritage match, quick 1-1 syllable combo
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Classic pairing, smooth 1-2 syllable flow
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Classic pairing, smooth 1-2 syllable flow
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Classic pairing, smooth 1-2 syllable flow
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Classic pairing, smooth 1-2 syllable flow
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Timeless choice, American heritage match, quick 1-1 syllable combo
-
Timeless choice, American heritage match, quick 1-1 syllable combo
-
Timeless choice, American heritage match, quick 1-1 syllable combo
Middle Names
Middle Names for Caius
6 name pairings with syllable flow tips
Sibling Names
Sibling Match
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Frequently Asked Questions About Caius
What does the name Caius mean?
"to rejoice, joyful" (from Latin). "earthly, of the earth" (from Etruscan). Caius is one of the most ancient Roman praenomina (personal names), derived from the Latin root connected to 'gaudere' — to rejoice. In classical Rome, Caius and Gaius were interchangeable spellings of the same name. The name appears throughout Roman history as one of the most common of all personal names, used across every social class from slaves to senators. Most famously, Gaius Julius Caesar bore this name — his full name being Gaius Iulius Caesar — making Caius one of the most historically resonant names in all of Western civilization.
What is the origin of the name Caius?
Caius has Latin, Etruscan, Roman, British, European, and American origins. In Latin, it means "to rejoice, joyful". In Etruscan, it means "earthly, of the earth".
Is Caius a boy or girl name?
Caius is primarily used as a boy name.
How popular is the name Caius?
Caius is currently ranked #1063 in popularity for boy names in the United States.
What are common nicknames for Caius?
Common nicknames for Caius include Cai and Kai.
What are good middle names for Caius?
Popular middle name pairings include Caius James, Caius John, Caius Edward, Caius William, Caius Alexander, and Caius Thomas.
What are good sibling names for Caius?
Names that pair well with Caius as siblings include Livia, Augustus, Felix, Octavia, Marcus, and Portia.
How many syllables does Caius have?
Caius has 2 syllables, making it easy to say and remember.
Is Caius a common or rare name?
Caius is an uncommon name, ranked #1063 in the US. Its rarity gives it a distinctive, memorable quality.
About the Name Caius
Caius is a boy name with Roman, British, European, and American origins . The name means "to rejoice, joyful" in Latin .
Caius is currently ranked #1,063 in popularity for boy names in the United States.
The name Caius has 2 syllables, making it easy to pronounce and remember.
Common nicknames for Caius include Cai and Kai. These shorter forms provide casual alternatives while keeping the elegance of the full name.
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Sources
- U.S. Social Security Administration — National Baby Names Data (popularity rankings and historical trends)
- Behind the Name (etymology and meaning research)
- NamingEverything editorial research and analysis