NameCensus.

UK girl's name

Caoilinn

A feminine Irish name possibly meaning "slender" or "beautiful" maiden.

For 2026, the newest official UK baby-name figures on this page are from 2021. That release is the current official benchmark rather than a forecast.

Caoilinn is a girl's name in the UK records. People looking for Caoilinn popularity in 2026 should use the latest official release, which is 2021 in this profile. In that release it ranked #5581, with 3 babies registered with the name. Its strongest year in the published records was 2012, with 3 births.

This profile covers 6 England and Wales registrations across 2 recorded years from 2012 to 2021. The figures come from ONS England and Wales, so the page is a view of published baby-name registrations rather than a forecast or a live count of people using the name today.

The latest count is about 100% of the recorded peak, which gives a quick read on how the name has moved since its high point.

We estimate that about 6 living people in the UK are called Caoilinn. This uses published birth registrations from England and Wales, Scotland and Northern Ireland, then applies ONS national life tables to estimate how many are likely still alive. It does not forecast extra births for 2022 or 2026.

Key insights

  • Caoilinn ranked #5581 for girls in England and Wales in 2021, with 3 registrations.
  • The name peaked in 2012, when 3 girls were registered as Caoilinn.
  • About 6 living people in the UK are estimated to have Caoilinn as a first name, after adjusting past birth registrations with ONS life tables.

Latest rank (E&W)

#5581

2021

Births in 2021

3

Latest year

Peak year

2012

3 births

Estimated living

6

2026

Meaning

What does Caoilinn mean?

Caoilinn is a feminine given name of Irish origin, derived from the Gaelic word "caol" meaning "slender" or "thin." The name has been in use since the early medieval period in Ireland, dating back to at least the 5th century.

The earliest recorded instance of the name Caoilinn can be found in the Annals of Ulster, a chronicle of medieval Irish history. The entry for the year 489 AD mentions a woman named Caoilinn who was the daughter of a local chieftain.

Throughout Irish history, the name Caoilinn has been associated with various notable figures. One of the most famous was Caoilinn of Kildare, a 6th-century abbess and saint who founded several monasteries in Ireland. Another notable bearer of the name was Caoilinn Ní Dhubhagáin, a 16th-century Irish poetess renowned for her works in the Irish language.

In the 17th century, Caoilinn O'Sullivan was a prominent Irish landowner and chieftain who fought against English forces during the Cromwellian conquest of Ireland. Her defiance and resistance against the English earned her a place in Irish folklore and legend.

Moving into the 20th century, Caoilinn Ní Bhuirne was an Irish language activist and writer who played a significant role in the Irish language revival movement in the early 1900s. She published several books and served as the editor of various Irish language publications.

While the name Caoilinn has its roots in Irish culture and history, it has also been adopted by people of various backgrounds around the world, particularly in English-speaking countries with Irish diaspora communities.

Sourced from namecensus.com.

Popularity

Caoilinn over time

The chart below shows babies named Caoilinn registered in England and Wales in the years where the name appears in the published records, from 2012 to 2021. Empty years are left out so rare names are not stretched across long periods where the published files do not show any registrations.

For Caoilinn, the clearest high point is 2012. The latest England and Wales figure is 3 births in 2021, compared with 3 at the peak.

Babies born per year

Caoilinn
01223201220162021

Decades

Caoilinn by decade

Decade totals smooth out the yearly jumps and make it easier to see whether Caoilinn was a short-lived spike or a name that stayed in regular use. Average rank is calculated only from years where a published rank exists.

Decade Average rank Total births Years covered
2020s #5581 3 1
2010s #5876 3 1

Related

Names similar to Caoilinn

FAQ

Caoilinn: questions and answers

How popular is the name Caoilinn in the UK right now?

In 2021, Caoilinn was ranked #5581 for girls in England and Wales, with 3 births registered.

When was Caoilinn most popular?

The peak year on record was 2012, with 3 babies registered as Caoilinn in England and Wales.

What is the meaning and origin of Caoilinn?

A feminine Irish name possibly meaning "slender" or "beautiful" maiden.

How many people are called Caoilinn in the UK?

A total of 6 babies have been registered as Caoilinn across the 2 years of ONS England & Wales records shown here.

Which records is this page based on?

The England and Wales timeline uses ONS baby-name records. Scotland figures come from NRS and Northern Ireland figures come from NISRA. Counts are registrations in published baby-name files. The living estimate uses those birth registrations with ONS national life tables.