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Caio

#3,321 in 2025Boys' name

Form of Gaius

Caio has been given to 722 babies in the U.S. since 1990. In 2025 it ranked #3,321 of 13,926 boys’ names in use. Its peak year was 2023, with 40 recorded.

Babies named Caio, 2025

1 in 94,700

Caio over time, 1880–2025

Boys
01020304018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Caio: meaning, origin, and history

Form of Gaius

Deeper origin not confirmed in the cited records

What Caio means

Caio is a form of Gaius.

Meaning behind the documented name family

The name developed through Caio → Gaius. The family’s proposed meaning is “to rejoice”, recorded in the naming reference for Gaius.

Origin, language, and formation

Caio is used in Italian, Portuguese and Spanish.

Caio comes through Latin Caius.

Related names and everyday forms

Related names include Gaius.

Pronunciation and spelling

In Italian, Caio is pronounced /ˈka.jo/.

American usage and historical context

In the United States, 722 boys were recorded with the name Caio between 1990 and 2025. Its highest annual count was 40 in 2023; its best national rank was #3,065 in 2023.

Over 5 years its rank rose, from #4,156 in 2020 to #3,321 in 2025. Over 10 years its rank rose, from #4,309 in 2015 to #3,321 in 2025.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

Wiktionary material is available under CC BY-SA 4.0.

How common is Caio?

Everything below is computed from the 2025 data — the most recent year available.

Among all babies, 2025
1 in 94,700
35 of 3,315,165 births
Among boys only
1 in 48,800
<0.01% of boys
Rank, 2025
#3,321
of 13,926 boys’ names in use
Coin-flip room size
65,655 kids
Even odds of a second one

Where Caio sits on the popularity scale

Rarest published (5 a year)#1 — Liam (20,818)

Chance at least one other child shares the name

If the other children were drawn at random from the 2025 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 500Under 1%

Put another way: gather 65,655 children born in 2025 and it's an even bet that one of them is another Caio. In a class of 30 the chance is Under 1%.

When Caios were born

Half of everyone ever recorded as Caio was born before 2013 — so the typical Caio is around 12 today.

Median birth year
2013
About 12 years old
Biggest decade
2010s
34.6% of all use
Born in the last 25 years
88.4%
A modern name
Recorded since 1950
722
People you could plausibly meet
Choose a decade

2010s — 34.6% of all recorded uses (250).

Is Caio rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
+385
Places climbed
Rank vs 5 years ago
+835
Places climbed
Rank vs 10 years ago
+988
Places climbed
Births vs 10 years ago
1.52×
More babies than then
Share of its own peak
87.5%
Peak was 2023 (40)
Years since peak
2
Years
Year-to-year steadiness
Volatile
25.3% average annual change
Best rank ever
#3,065
2023

Spellings of Caio

Caio is not the most common spelling — Carl is, with 35.9% against Caio's 0.05%.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Where Caio is used

Across 1910–2025, Caio was most concentrated in Massachusetts — about 1 in 50,000 boys, against 1 in 144,444 across all states with data. It was least common in California (1 in —).

02 per 100,000

Most concentrated

  1. 1Massachusetts1 in 50,000
  2. 2Florida1 in 100,000
  3. 3California1 in —

Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Caio has too little recent state data to map, so this covers all years from 1910.

Caio around the world

Where Caio ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • England & Wales
    1996–2025
    #873
    in 2025
  • Ireland
    2020–2024
    #655
    in 2024
  • France
    2020–2021
    #5,269
    in 2021
  • Canada
    2012–2022
    #2,959
    in 2022

Popularity data from Office for National Statistics, Central Statistics Office, Institut national de la statistique et des études économiques and Statistics Canada. ONS data under Open Government Licence v3.0. CSO data under CC BY 4.0. INSEE data under Licence Ouverte / Etalab 2.0. StatCan data under Statistics Canada Open Licence.

Caio by the numbers

The raw record for each sex the name is used for.

As a boy's name

Rank in 2025
#3,321
Trend vs 5 yrs ago
Up 835
Best rank ever
#3,065
2023
Peak year
2023
40 that year
First recorded
1990
Last recorded
2025
All-time count
722
Count in 2025
35

Names similar to Caio

Matched on shared beginnings and endings, similar length, and comparable popularity.

CaiCaidynKaioCaineCainenCaisenCainanCaisonCaiusCaidanCainCaideCailenCaigeCaidCaisynCairoMakaioCailCailebCaidonTaioCailanCailo

Sibling names for Caio

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Caio

Top names of 2023, Caio's peak yearThe 2020s in fullOther names that peaked in 2023Boys' names starting with C