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Home › Baby Names Directory › Kaio

Kaio

♂ Boy

Pronounced KY-oh /ˈkaɪ.oʊ/Medium

Meaning: Portuguese form of Caio — from Roman Gaius, traditionally 'to rejoice'Low

In 30 seconds: Roman roots, Brazilian bounce: Kaio is the Portuguese Caio — from Gaius, 'to rejoice'. Bright, breezy, and classical.
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Origin MediumLatin, Portuguese
MeaningPortuguese form of Caio — from Roman Gaius, traditionally 'to rejoice'
U.S. rank (2025)#4619 ↘ Falling
2025 U.S. births22 boys (0.00% of U.S. boys)
Peak year2023
Total births (all-time)≈ 429

Popularity in the U.S. · SSA data

peak 202419932025

U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.

SSA data updated May 2026. How we source & verify this data.

History & Origin

Kaio is a spelling of the Portuguese Caio — from the Roman Gaius, traditionally 'to rejoice' (the ancient meaning is uncertain, which we note). A bright, popular name in Brazil, it pairs classical roots with a sunny sound.

In the U.S. it appears in Brazilian families. Rare, to-rejoice at the (traditional) root, and bright.

Did you know? Kaio (Caio) comes from the ancient Roman Gaius — one of Rome's most common names (Julius Caesar's first name) — traditionally read 'to rejoice'.
Overall data confidence 70%
Behind the Name — Caio — meaning traditional

Variations

CaioGaiusKaius

Nicknames

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Famous Bearers

  • ★Kaio Clark (2003-)
    American professional basketball player selected in the 2024 NBA Draft

If you like Kaio…

Caio— the standard spelling
Kai— a fellow bright Ka- name
Gaius— the Roman original
Lucio— a similarly popular pick
Kristian— a fellow Latin choice

Explore names like Kaio

By themeuncertainlatinportuguese
By meaningSnow / Winter

All themes →All meanings →All origins →

Frequently Asked

What does the name Kaio mean?

Kaio is the Portuguese Caio, from Roman Gaius, traditionally 'to rejoice'; the ancient meaning is uncertain.

How do you pronounce Kaio?

It's said KY-oh /ˈkaɪ.oʊ/ — two syllables, stress on the first.

Is Kaio a boy or girl name?

Kaio is a boy's name.

How popular is Kaio?

Kaio is a rare name in the U.S.

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