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Caoilinn

Girls' name

Literal meaning not recorded; Irish origin

Caoilinn has been given to 46 babies in the U.S. since 1997. 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 1997, with 7 recorded.

Babies named Caoilinn, 2016

1 in 612,000

Caoilinn over time, 1880–2025

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Caoilinn: meaning, origin, and history

Literal meaning not recorded; Irish origin

Irish

What Caoilinn means

Caoilinn is a given name.

Origin, language, and formation

Caoilinn is used in English. Its origins include Irish.

American usage and historical context

In the United States, 46 girls were recorded with the name Caoilinn between 1997 and 2016. Its highest annual count was 7 in 1997; its best national rank was #11,047 in 1997.

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 Caoilinn?

Caoilinn had fewer than 5 recorded uses in 2025, so these figures use 2016, the last year it was published.

Among all babies, 2016
1 in 612,000
6 of 3,669,531 births
Among girls only
1 in 295,000
<0.01% of girls
Rank, 2016
Unranked
Fewer than 5 uses
Coin-flip room size
423,922 kids
Even odds of a second one

Where Caoilinn sits on the popularity scale

Rarest published (5 a year)#1 — Olivia (13,544)

Chance at least one other child shares the name

If the other children were drawn at random from the 2016 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 423,922 children born in 2016 and it's an even bet that one of them is another Caoilinn. In a class of 30 the chance is Under 1%.

When Caoilinns were born

Half of everyone ever recorded as Caoilinn was born before 2008 — so the typical Caoilinn is around 17 today.

Median birth year
2008
About 17 years old
Biggest decade
2010s
50.0% 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 — 50.0% of all recorded uses (23).

Is Caoilinn 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 1997 (7)
Years since peak
28
Years
Year-to-year steadiness
Shifting
18.3% average annual change
Best rank ever
#11,047
1997

Spellings of Caoilinn

Caoilinn is not the most common spelling — Cailin is, with 75.1% against Caoilinn's 0.93%.

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.

Caoilinn around the world

Where Caoilinn 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
    2012–2021
    #5,581
    in 2021
  • Ireland
    1994–2025
    #544
    in 2025
  • South Australia
    2003–2003
    #739
    in 2003

Popularity data from Office for National Statistics, Central Statistics Office and Consumer and Business Services (South Australia). ONS data under Open Government Licence v3.0. CSO, CBS SA data under CC BY 4.0.

Caoilinn by the numbers

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

As a girl's name

Rank in 2025
Unranked
Trend vs 5 yrs ago
—
Best rank ever
#11,047
1997
Peak year
1997
7 that year
First recorded
1997
Last recorded
2016
All-time count
46
Count in 2025
Under 5

Names similar to Caoilinn

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

CaoilainnCaoimheMadelinnShaylinnKaytlinnJasminnEmmalinnRaylinnAdelinnCaitlinnAyslinnCorrinnOaklinnAibhlinnBraylinnRaelinnBrylinnFaylinnKatelinnAdalinnMaylinnKaitlinnMadalinnJazminn

Sibling names for Caoilinn

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 Caoilinn

Top names of 1997, Caoilinn's peak yearThe 1990s in fullOther names that peaked in 1997Girls' names starting with C