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.
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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?