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Cayo

Boys' name

Diminutive of Acadio

Cayo has been given to 46 babies in the U.S. since 2001. It was used fewer than 5 times in 2025, so it doesn't appear in the latest year's list — today it's a genuinely uncommon pick. Its peak year was 2018, with 8 recorded.

Babies named Cayo, 2023

1 in 474,000

Cayo over time, 1880–2025

Boys
0246818801900192019401960198020002020

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Cayo: meaning, origin, and history

Diminutive of Acadio

Deeper origin not confirmed in the cited records

What Cayo means

Cayo is a diminutive of Acadio.

Origin, language, and formation

Cayo is used in Asturian.

Related names and everyday forms

Related names include Acadio.

Pronunciation and spelling

In Asturian, Cayo is pronounced /ˈkaʝo/.

American usage and historical context

In the United States, 46 boys were recorded with the name Cayo between 2001 and 2023. Its highest annual count was 8 in 2018; its best national rank was #8,960 in 2018.

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 Cayo?

Cayo had fewer than 5 recorded uses in 2025, so these figures use 2023, the last year it was published.

Among all babies, 2023
1 in 474,000
7 of 3,314,783 births
Among boys only
1 in 244,000
<0.01% of boys
Rank, 2023
Unranked
Fewer than 5 uses
Coin-flip room size
328,234 kids
Even odds of a second one

Where Cayo 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 2023 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 328,234 children born in 2023 and it's an even bet that one of them is another Cayo. In a class of 30 the chance is Under 1%.

When Cayos were born

Half of everyone ever recorded as Cayo was born before 2018 — so the typical Cayo is around 7 today.

Median birth year
2018
About 7 years old
Biggest decade
2010s
39.1% of all use
Born in the last 25 years
100.0%
A modern name
Recorded since 1950
46
People you could plausibly meet
Choose a decade

2010s — 39.1% of all recorded uses (18).

Is Cayo 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
—
Not ranked then
Rank vs 5 years ago
New entry
Not ranked then
Rank vs 10 years ago
—
Not ranked then
Births vs 10 years ago
—
Not published both years
Share of its own peak
0%
Peak was 2018 (8)
Years since peak
7
Years
Year-to-year steadiness
Volatile
28.5% average annual change
Best rank ever
#8,960
2018

Spellings of Cayo

Cayo is not the most common spelling — Carl is, with 41.4% against Cayo's <0.01%.

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.

Cayo around the world

Where Cayo 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
    2006–2020
    #3,848
    in 2020

Popularity data from Office for National Statistics. ONS data under Open Government Licence v3.0.

Cayo by the numbers

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

As a boy's name

Rank in 2025
Unranked
Trend vs 5 yrs ago
—
Best rank ever
#8,960
2018
Peak year
2018
8 that year
First recorded
2001
Last recorded
2023
All-time count
46
Count in 2025
Under 5

Names similar to Cayo

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

CaydCaylixCaylCaynanCaycenCaylumCayseCaydnCaynCaymonTayoCaylobCaynenCayneKayoCaydynRayoCayceCaylinCayCaysinDayoCaylorCaylen

Sibling names for Cayo

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 Cayo

Top names of 2018, Cayo's peak yearThe 2010s in fullOther names that peaked in 2018Boys' names starting with CAsturian Boy NamesAsturian Names