Caoilainn
- Gender
- Girl
- Say it
- KEE-lin
- Origin
- Irish
Caoilainn is a girls' name of Irish origin, meaning “slender and fair”. Too few babies were given it in the latest year to rank.
What does Caoilainn mean?
Irish: variant of Caoilfhionn, from caol 'slender' and fionn 'fair'
“slender and fair”
Variant of Caoilfhionn, a traditional Irish girl's name made from the words caol, slender, and fionn, fair.
Is Caoilainn a girl's or a boy's name?
Caoilainn is a girls' name.
How popular is Caoilainn in the UK?
No girls in the UK were given it in 2025, or too few to be listed. Its busiest year was 2011, with 6 girls.
Caoilainn in the UK, year by year
| Year | Girls | Rank |
|---|---|---|
| 2022 | 1 | #7,487 |
| 2021 | 0 | – |
| 2020 | 0 | – |
| 2019 | 0 | – |
| 2018 | 1 | #7,536 |
| 2017 | 0 | – |
| 2016 | 1 | #7,664 |
| 2015 | 6 | #3,777 |
| 2014 | 5 | #4,187 |
| 2013 | 1 | #7,690 |
| 2012 | 1 | #7,881 |
| 2011 | 6 | #3,737 |
| 2010 | 0 | – |
| 2009 | 2 | #7,309 |
| 2008 | 0 | – |
| 2007 | 4 | #4,494 |
| 2006 | 0 | – |
| 2005 | 4 | #4,150 |
| 2004 | 3 | #4,789 |
| 2003 | 0 | – |
| 2002 | 0 | – |
| 2001 | 0 | – |
| 2000 | 3 | #4,074 |
Names like Caoilainn
Names given in the same years and the same naming tradition, with a similar sound.
Aoibheann, Keira, Teagan, Cassidy, Caragh, Eireann, Raegan, Bree, Caitlin, Eowyn, Cliodhna, Tegan
More Irish names
Oscar, Rowan, Rory, Maeve, Finn, Aiden, Ryan, Nolan, Quinn, Orla, Cody, Erin, Ronan, Connor, Declan, Casey
Sources
Figures from Baby names in England and Wales (Office for National Statistics), Babies' first names (National Records of Scotland) and Baby names (Northern Ireland Statistics and Research Agency). Nameling last updated them on 20 October 2026. How the figures are worked out, and the data to download.
To cite this page: Nameling, “Caoilainn: name meaning, origin and popularity”, https://www.nameling.co.uk/names/caoilainn, updated 20 October 2026.