"to rejoice, to be glad"
Origin: Latin
Language: Latin
Caio
Does Caio flow with your last name?
An ancient Roman name thriving in modern Brazil
Brazilian
Portuguese
Italian
Roman
Classic
Bold
Elegant
Strong
Reviewed by the NamingEverything Editorial Team · Updated
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Nicknames
Nicknames for Caio
2 shorthand options for every setting
Meaning & Origin
"rejoice"
Origin: Old Latin
Language: Portuguese
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The Story of Caio
Caio is the Portuguese and Brazilian form of Caius (also spelled Gaius), an ancient Roman praenomen meaning 'to rejoice' or 'to be glad,' from the Latin 'gaudere.' Gaius was one of the most common names in ancient Rome — Julius Caesar's first name was actually Gaius Julius Caesar. The Portuguese spelling Caio is widely used in Brazil, where it has become a modern classic.
Caio is consistently popular in Brazil, ranking among the top 100 names for boys. Its ancient Roman roots give it classical credibility while its phonetic simplicity (similar to 'Kai') appeals to modern parents. Outside Brazil, it remains distinctive and rarely used.
In ancient Rome, Gaius was among the three most common praenomina (first names), alongside Marcus and Lucius. The abbreviation 'C.' for Gaius appears throughout Roman inscriptions and texts. In Brazil, Caio represents the Romanized legacy of Portuguese colonial culture.
Historical Record
Caio first appeared in US Social Security records in 1990.
Over 687 babies have been named Caio in the United States since SSA records began.
Today, Caio is rising quickly in popularity , currently ranked #3,730 for boy names in the US .
Fun Facts
- Julius Caesar's given name was Gaius (the Latin form of Caio) — so 'Gaius Julius Caesar' was his full name
- Caio is one of the top 50 most popular names for boys in Brazil, where it has been used since the colonial period
Caio in Other Languages
Latin
Gaius
English
Caius
Italian
Caio
Spanish
Cayo
Portuguese
Caio
Popularity Over Time
#3,730
Current Rank
Rising
Trend
Rising Fast
Based on SSA data 1880–present
Year-by-year popularity data will be available soon.
Famous People Named Caio
C
Caio Cobra
Athlete
1991
Brazilian professional soccer player who has played for clubs across Brazil and Asia
G
Gaius Julius Caesar
Military
Roman dictator (100-44 BCE) whose praenomen Gaius is the Latin form of Caio; one of history's most famous figures
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Compare Caio with:
Quick Facts
- Gender
- Boy
- Syllables
- 3
- Popularity Rank
- #3,730
- Total SSA Count
- 30
- Cultural Origins
- Brazilian Portuguese Italian Roman
- Pronunciation
- Moderate
- Formality
- Moderate
- Cross-Cultural Ease
- Moderate
Alternative Spellings
Common Nicknames
Kai
Ca
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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Classic pairing, smooth 1-3 syllable flow
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Timeless choice, bold style, quick 1-1 syllable combo
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Timeless choice, bold style, quick 1-1 syllable combo
-
Classic pairing, smooth 1-3 syllable flow
-
Timeless choice, classic style, quick 1-1 syllable combo
-
Timeless choice, classic style, quick 1-1 syllable combo
-
Classic pairing, smooth 1-3 syllable flow
-
Classic pairing, smooth 1-2 syllable flow
Middle Names
Middle Names for Caio
6 name pairings with syllable flow tips
Sibling Names
Sibling Match
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Frequently Asked Questions About Caio
What does the name Caio mean?
"to rejoice, to be glad" (from Latin). "rejoice" (from Old Latin). Caio is the Portuguese and Brazilian form of Caius (also spelled Gaius), an ancient Roman praenomen meaning 'to rejoice' or 'to be glad,' from the Latin 'gaudere.' Gaius was one of the most common names in ancient Rome — Julius Caesar's first name was actually Gaius Julius Caesar. The Portuguese spelling Caio is widely used in Brazil, where it has become a modern classic.
What is the origin of the name Caio?
Caio has Latin, Old Latin, Brazilian, Portuguese, Italian, and Roman origins. In Latin, it means "to rejoice, to be glad". In Old Latin, it means "rejoice".
Is Caio a boy or girl name?
Caio is primarily used as a boy name.
How popular is the name Caio?
Caio is currently ranked #3730 in popularity for boy names in the United States.
What are common nicknames for Caio?
Common nicknames for Caio include Kai.
What are good middle names for Caio?
Popular middle name pairings include Caio Alexandre, Caio Felipe, Caio Henrique, Caio Lucas, Caio Rafael, and Caio Miguel.
What are good sibling names for Caio?
Names that pair well with Caio as siblings include Enzo, Mateus, Pedro, Giovanna, Isadora, and Valentina.
How many syllables does Caio have?
Caio has 3 syllables, making it distinctive and rhythmic.
Is Caio a common or rare name?
Caio is an uncommon name, ranked #3730 in the US. Its rarity gives it a distinctive, memorable quality.
What boy names are similar to Caio?
About the Name Caio
Caio is a boy name with Brazilian, Portuguese, Italian, and Roman origins . The name means "to rejoice, to be glad" in Latin .
Caio is currently ranked #3,730 in popularity for boy names in the United States.
The name Caio has 3 syllables, making it distinctive and memorable.
Common nicknames for Caio include Kai and Ca. These shorter forms provide casual alternatives while keeping the elegance of the full name.
Alternative spellings of Caio include Cairo, Caiden, Cain, Caius, Cai . Each spelling variation gives the name a slightly different character while preserving its sound and meaning.
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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