UK girl's name
Caoilainn
A feminine Irish name meaning "slender", "slim", or "graceful".
For 2026, the newest official UK baby-name figures on this page are from 2015. That release is the current official benchmark rather than a forecast.
Caoilainn is a girl's name in the UK records. People looking for Caoilainn popularity in 2026 should use the latest official release, which is 2015 in this profile. In that release it ranked #4736, with 4 babies registered with the name. Its strongest year in the published records was 2011, with 4 births.
This profile covers 18 England and Wales registrations across 5 recorded years from 2004 to 2015. The figures come from ONS England and Wales and NISRA Northern Ireland, 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 24 living people in the UK are called Caoilainn. 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 2016 or 2026.
Key insights
- • Caoilainn ranked #4736 for girls in England and Wales in 2015, with 4 registrations.
- • The name peaked in 2011, when 4 girls were registered as Caoilainn.
- • Caoilainn ranks best in Northern Ireland in the latest published regional snapshot for that area, where it placed #413 in 2007.
- • About 24 living people in the UK are estimated to have Caoilainn as a first name, after adjusting past birth registrations with ONS life tables.
Latest rank (E&W)
#4736
2015
Births in 2015
4
Latest year
Peak year
2011
4 births
Estimated living
24
2026
Meaning
What does Caoilainn mean?
The given name Caoilainn is an Irish Gaelic name that has its origins dating back to the early medieval period in Ireland. It is derived from the Gaelic words 'caol', meaning slender or thin, and 'fionn', meaning fair or white. The name translates to 'slender and fair' or 'slender and white'.
Caoilainn was a popular name among the ancient Celtic tribes of Ireland, particularly in the regions of Munster and Connacht. It was often given to newborn girls who were perceived to have a delicate or slender physical appearance. The name was also associated with beauty and grace, reflecting the cultural values and ideals of the time.
While there are no direct references to the name Caoilainn in ancient Irish texts or religious scriptures, it has been documented in various historical records and genealogies. One of the earliest recorded examples of the name can be found in the Annals of the Four Masters, a chronicle of medieval Irish history compiled in the 17th century.
Throughout history, there have been several notable individuals who bore the name Caoilainn. One such figure was Caoilainn Ní Cheallaigh (1292-1367), a renowned Irish noblewoman and chieftain of the Uí Cheallaigh clan in County Sligo. She played a significant role in the Irish campaigns against the Anglo-Norman invasions during the 14th century.
Another notable Caoilainn was Caoilainn Ní Dhomhnaill (1563-1627), a member of the powerful O'Donnell dynasty in Ulster. She was a skilled poet and patron of the arts, known for her patronage of bards and scholars during the Gaelic literary revival of the 16th century.
In the 18th century, Caoilainn Ní Mhurchadha (1712-1789) was a prominent Irish harpist and composer from County Cork. She was renowned for her mastery of the traditional Irish harp and her contributions to the preservation of ancient Gaelic music.
Caoilainn Nic Giolla Bhríde (1851-1928) was a celebrated Irish language scholar and teacher from County Donegal. She played a crucial role in the preservation and promotion of the Irish language during the Gaelic Revival of the late 19th and early 20th centuries.
Lastly, Caoilainn Ní Chonaire (1905-1982) was a notable Irish writer and translator from County Kerry. She was best known for her translations of works by prominent authors such as Oscar Wilde and James Joyce into the Irish language, contributing to the preservation and promotion of Irish literature.
Sourced from namecensus.com.
Popularity
Caoilainn over time
The chart below shows babies named Caoilainn registered in England and Wales in the years where the name appears in the published records, from 2004 to 2015. Empty years are left out so rare names are not stretched across long periods where the published files do not show any registrations.
For Caoilainn, the clearest high point is 2011. The latest England and Wales figure is 4 births in 2015, compared with 4 at the peak.
Babies born per year
Decades
Caoilainn by decade
Decade totals smooth out the yearly jumps and make it easier to see whether Caoilainn 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 |
|---|---|---|---|
| 2010s | #4728 | 12 | 3 |
| 2000s | #4698 | 6 | 2 |
Geography
Where Caoilainn is most common
The bars show the latest published local birth counts for Caoilainn. They are useful for spotting where the name is showing up in real numbers, while the rank beside each bar shows how strongly it performs inside that region.
Caoilainn ranks best in Northern Ireland in the latest published regional snapshot for that area, where it placed #413 in 2007.
Across the UK
Caoilainn in Scotland and Northern Ireland
Northern Ireland (NISRA)
#413 in 2007
2 years of NISRA records, 6 total registered
Related
Names similar to Caoilainn
- Chloe 111,265
- Charlotte 88,733
- Caitlin 28,931
- Courtney 23,162
- Chelsea 13,049
- Clara 9,435
- Connie 8,402
- Catherine 8,376
- Charlie 7,964
- Cerys 7,506
- Casey 7,018
- Cara 6,375
FAQ
Caoilainn: questions and answers
How popular is the name Caoilainn in the UK right now?
In 2015, Caoilainn was ranked #4736 for girls in England and Wales, with 4 births registered.
When was Caoilainn most popular?
The peak year on record was 2011, with 4 babies registered as Caoilainn in England and Wales.
What is the meaning and origin of Caoilainn?
A feminine Irish name meaning "slender", "slim", or "graceful".
How many people are called Caoilainn in the UK?
A total of 18 babies have been registered as Caoilainn across the 5 years of ONS England & Wales records shown here and 6 in Northern Ireland.
Where is Caoilainn most common?
In the latest published local rankings, Caoilainn ranks best in Northern Ireland, where it placed #413 in 2007. The regional bars on this page use birth counts, so they also reflect the size of each region.
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.