Caio

/K-AA-IH-OW/

Boy Christian Portuguese origin BrazilianPortuguese

Caius (Brazilian form) — Caio (Portuguese, from Latin Caius/Gaius 'rejoice') is the Portuguese-Brazilian form of the Roman first-name Gaius. The Caio-spelling reflects Portuguese phonology. Caio Castro is a popular Brazilian telenovela actor; Caio Blat is a celebrated Brazilian theater-film actor.

Get Caio's full report — patron saint, feast day & a portrait — free

Quick — what every Christian parent asks about Caio:

🕯️ Caio's patron saint & feast day? 🔊 Does Caio go with siblings? 👥 Is Caio too common? 🔢 What does Caio's numerology say? 👶 Is Caio right for your baby?
The answer to all of it — NameRoot Caio, scored for your family & heritage — free.
The one thing this page can't tell you

How well does Caio fit your family?

This page tells you what Caio means. The app tells you whether it's right for your baby — scored against your family & your heritage, and your baby's birth details.

Unlock Caio's score — free
NameRoot scoring a name across six signals — phonetics, numerology, birth star, culture, meaning and uniqueness

Six signals — scored for your family & heritage, not in the abstract:

🌟
Birth starAuspicious for your baby?
🔢
NumerologyDestiny 1, matched to you
🔊
PhoneticsSounds right with siblings?
💗
MeaningThe Joy cluster
🛕
HeritageWill grandparents approve?
✨
UniquenessCommon, or one-of-a-kind?

Meaning & origin

Yes — Caio is a Christian boy name of Portuguese origin, meaning “Caius (Brazilian form) — Caio (Portuguese, from Latin Caius/Gaius 'rejoice') is the Portuguese-Brazilian form of the Roman first-name Gaius. The Caio-spelling reflects Portuguese phonology. Caio Castro is a popular Brazilian telenovela actor; Caio Blat is a celebrated Brazilian theater-film actor.”.

Caio is a boy's name of Portuguese origin, traditionally used in Christian families. The name means "Caius (Brazilian form) — Caio (Portuguese, from Latin Caius/Gaius 'rejoice') is the Portuguese-Brazilian form of the Roman first-name Gaius. The Caio-spelling reflects Portuguese phonology. Caio Castro is a popular Brazilian telenovela actor; Caio Blat is a celebrated Brazilian theater-film actor." and belongs to the Joy cluster — names that celebrate happiness and lightness of spirit.

Common among Brazilian, Portuguese, Angolan, Mozambican, CapeVerdean families, Caio carries cultural weight that goes beyond its dictionary definition — it's a name with a story and a community.

The patron saint & feast day behind Caio

Many Christian names carry a patron saint and a feast day (name day) — a tradition of choosing a name for the saint a child is born near, or one the family holds dear. Caio lives in this tradition of meaning and heritage.

An AI baby portrait and family score in the NameRoot app

NameRoot connects the dots. See Caio's patron saint, its feast day, and whether it aligns with your baby's birth — alongside its full family score.

See Caio's saint & feast day →

What does Caio's numerology say?

Numerology assigns each name a single-digit destiny number by summing its letter values. Different schools use different mappings — NameRoot computes both so you can see how Caio resonates in either tradition.

Pythagorean
1
leadership and pioneering spirit
Chaldean
3
creativity and joyful expression

Caio's destiny number is 1 — but a number only matters in context. The app matches it to your family's own numbers for a real compatibility read. See Caio's full reading →

Does Caio go with your family's names?

Caio breaks into 4 sounds: /K-AA-IH-OW/. The real test isn't how it sounds alone — it's how it sounds beside the names already in your family: yours, your partner's, and any brothers or sisters. NameRoot scores that harmony, so Caio sits naturally next to a Mum and Dad like Michael & Anna, or a big sister named Gianna — no awkward clashes, no two names that blur together. Hear Caio beside your family's names →

Names similar to Caio

If Caio resonates with you, these names live in the same world — drawn from the same tradition, sharing the same meaning, or echoing a similar sound.

From the same tradition

Other Christian boy names, common in Brazilian families

Thiago
He who supplants — the Brazilian Portuguese form of James/Santiago. A name that has exploded in popularity across Brazil and Latin America, carrying the energy of youth, sport, and modern Brazilian culture.
Tiago
James (Portuguese form) — Tiago (Portuguese, from Late Latin Sanctus Iacobus contracted to Sant'Iago, then Tiago) is the Portuguese form of James, the apostle. The Portuguese pilgrimage tradition to Santiago de Compostela ('Saint James of the Field of Stars') made Tiago foundational.
Diogo
Teaching — the Portuguese form parallel to Tiago, from Late Latin Didacus. Borne by the explorer Diogo Cao, the first European to reach the mouth of the Congo River, who raised stone pillars along the African coast to mark Portuguese discovery. A name of the Age of Discoveries, carried across the Lusophone world.
Afonso
Noble and ready — from Old German adal (noble) + funs (ready), the Portuguese form of Alphonse. Borne by Afonso the First, who founded Portugal as an independent kingdom and won its independence at the Battle of Ourique. A foundational Portuguese national name uniting the warrior virtues of nobility and readiness.

Sharing the same meaning

Other Christian boy names from the Joy cluster

Felix
Happy, fortunate, blessed by luck — Felix is the Roman conviction that happiness is not an accident but a state that attaches itself to certain people like sunlight to a south-facing wall. Multiple saints and four popes bore this name, and it carries the warm optimism of Latin culture, the confidence that life tilts toward joy, and the simple, radical claim that this child was born under a lucky star
Reuben
Behold, a son — Jacob's firstborn. A name of wonder at a child's arrival
Asher
Happy, blessed, the fortunate one — Asher is the son of Jacob whose tribe inherited the fertile coastal lands of northern Israel, rich with olive oil and bread. His mother Leah declared at his birth, happy am I, for the daughters will call me blessed

Names that sound similar

Christian boy names that open with the same syllables as Caio

Connor
Lover of hounds, from Irish Gaelic Conchobhar, joining a word for hound or wolf to a root suggesting desire or aid. Borne by a legendary king of Ulster, it became a widespread Irish name and surname, later a favourite across the wider English-speaking world.
Colin
From Gaelic cailean, a pup or young dog; also a medieval short form of Nicholas, victory of the people
Carlos
Free man — five Spanish kings, one emperor. Carlos is Spain's answer to Charles and Karl combined

Explore more names

Keep exploring names like Caio — by tradition, by meaning, or by first letter.

Christian boy namesNames that mean joyNames starting with C All baby names

Common questions about Caio

What does the name Caio mean?

Caio means "Caius (Brazilian form) — Caio (Portuguese, from Latin Caius/Gaius 'rejoice') is the Portuguese-Brazilian form of the Roman first-name Gaius. The Caio-spelling reflects Portuguese phonology. Caio Castro is a popular Brazilian telenovela actor; Caio Blat is a celebrated Brazilian theater-film actor.." It is a boy name of Portuguese origin, traditionally used in Christian families.

Is Caio a boy or girl name?

Caio is most commonly used as a boy name.

What is the origin of the name Caio?

Caio is of Portuguese origin, used in Christian tradition, commonly among Brazilian, Portuguese, Angolan families.

Is Caio a Christian name?

Yes. Caio is a boy name traditionally used in Christian families, of Portuguese origin.

What does Caio mean in Portuguese?

Caio originates from Portuguese, where it means "Caius (Brazilian form) — Caio (Portuguese, from Latin Caius/Gaius 'rejoice') is the Portuguese-Brazilian form of the Roman first-name Gaius. The Caio-spelling reflects Portuguese phonology. Caio Castro is a popular Brazilian telenovela actor; Caio Blat is a celebrated Brazilian theater-film actor.."

What is the numerology of Caio?

Caio has a Pythagorean destiny number of 1 — leadership and pioneering spirit.

When is Caio's feast day?

Caio's feast day — its traditional Christian name day — is April 22.

See how Caio scores for your family

NameRoot is the only baby-name app that scores every name across 6 signals against your specific family context. Download free — Caio is waiting.

Get NameRoot — free