| Glottolog Languoid Names | art-326 |
| Breton | |
| ISO 639-3 | art-001 | bre |
| Glottocode | art-327 | bret1244 |
| Glottolog Primary Key | art-328 | 38486 |
| UNESCO Atlas of the World’s Languages in Danger ID | art-329 | 336 |
| English | eng-000 | Breton |
| français | fra-000 | breton |
| español | spa-000 | bretón |