How Many Celtic Languages Are There? All 6 Living Languages, Explained
There are six living Celtic languages. Three belong to the Goidelic branch (Irish, Scottish Gaelic, Manx) and three to the Brythonic branch (Welsh, Cornish, Breton). All six are spoken in western Europe today, although speaker numbers vary widely.
The six Celtic languages
| Language | Native name | Branch | Speakers | Where |
|---|---|---|---|---|
| Welsh | Cymraeg | Brythonic | ~538,000 regular | Wales |
| Irish | Gaeilge | Goidelic | ~70,000 daily; 1.7M with some ability | Ireland |
| Breton | Brezhoneg | Brythonic | ~200,000 | Brittany, France |
| Scottish Gaelic | Gàidhlig | Goidelic | ~57,000 | Scotland |
| Manx | Gaelg | Goidelic | ~2,200, growing | Isle of Man |
| Cornish | Kernewek | Brythonic | ~600 fluent, growing | Cornwall, England |
Why two branches?
The split between Goidelic and Brythonic happened more than two thousand years ago. The clearest difference is a sound change: where Goidelic kept the original Proto-Celtic kw sound (written as c in modern spelling), Brythonic shifted it to p. So the Goidelic word for four is ceathair and the Brythonic word is pedwar; the Goidelic for son is mac and the Brythonic is mab. That single change, repeated across the lexicon, gave each branch a distinctive shape.
For more on the split, see Goidelic vs Brythonic: how the Celtic languages split.
Are Manx and Cornish really alive?
Both languages had a period when no native speakers were left. Manx lost its last traditional native speaker, Ned Maddrell, in 1974. Cornish lost its last in the late 18th or early 19th century, with Dolly Pentreath often cited (the date and identity are debated). Both languages have been revived through schools, classes, and family transmission, and both now have new native speakers raised bilingually from birth.
UNESCO no longer classifies either as extinct. Manx is listed as "critically endangered" and Cornish as "critically endangered" with active revival.
Are there extinct Celtic languages?
Yes. The Celtic family was once much larger. Continental Celtic languages including Gaulish (spoken across what is now France), Celtiberian (Spain), Galatian (modern Turkey), and Lepontic (northern Italy) all died out by the early medieval period. They survive only in inscriptions, place names, and loanwords. Of the Insular Celtic family on the British Isles and Brittany, the six modern languages above are the only survivors.
Where to start
If you want to learn one, the choice usually comes down to heritage, geography, or learning resources. Welsh and Irish have the most material. blas. teaches both today, with Scottish Gaelic and Breton next on the roadmap.
Frequently asked questions
How many Celtic languages are there?
There are six living Celtic languages: Irish (Gaeilge), Welsh (Cymraeg), Scottish Gaelic (Gàidhlig), Breton (Brezhoneg), Cornish (Kernewek), and Manx (Gaelg). They split into two branches: Goidelic (Irish, Scottish Gaelic, Manx) and Brythonic (Welsh, Cornish, Breton).
Are Cornish and Manx really Celtic if they died out?
Yes. Manx lost its last native speaker in 1974 and Cornish lost its last in the late 18th or early 19th century, but both have been revived. Today Manx has roughly 2,200 speakers and Cornish has around 600 fluent speakers, with both numbers slowly growing through schools, classes, and family transmission.
Which Celtic language has the most speakers?
Welsh has the most regular speakers, at around 538,000 according to the 2021 Census. Irish has more people with some ability (1.7 million per the 2022 Census), but fewer daily speakers (roughly 70,000 to 80,000). Breton has an estimated 200,000 speakers, Scottish Gaelic about 57,000, Manx about 2,200, and Cornish around 600.
Are there any extinct Celtic languages?
Yes. Continental Celtic languages including Gaulish, Celtiberian, Galatian, and Lepontic all died out by the early medieval period as Latin and Germanic languages spread. Of the Insular Celtic family, only the six Goidelic and Brythonic languages survive into the modern era.
Editorial notes
- Review methodology
- This guide is checked against the linked language authorities and first-party resources. The editorial review checks terminology, links, and whether statements are clearly distinguished from blas. product information.
Ready to make this stick?
blas. is the language app for adults coming back to Irish or Welsh. Grammar, vocabulary, mutations, conversation — all with spaced repetition so you actually remember it.
Keep reading
The 6 Celtic Languages and How They Compare
Irish, Welsh, Scottish Gaelic, Breton, Cornish, and Manx: speaker numbers, the Goidelic and Brythonic split, mutual intelligibility, and what sets each apart.
Goidelic vs Brythonic: How the Celtic Languages Split
The Celtic family broke into two branches. Goidelic kept the original kw sound, Brythonic shifted to p. Why the split happened, where each branch lives today, and how they differ.
Irish vs Scottish Gaelic: How Different Are They Really?
Same roots, different languages. Side-by-side spelling, pronunciation, grammar, and vocabulary comparison. Plus: can speakers understand each other?