| ISO 639-3 | art-001 |
| cym | |
| ISO 639-2/T | art-002 | cym |
| ISO 639-2/B | art-003 | wel |
| ISO 639-1 | art-004 | cy |
| ISO 639-3 Reference Names | art-289 | Welsh |
| ISO 639-3 Print Names | art-290 | Welsh |
| ISO 639-3 Inverted Names | art-291 | Welsh |
| Ethnologue Primary Language Names | art-323 | Welsh |
| Glottolog Languoid Names | art-326 | Welsh |
| Glottocode | art-327 | wels1247 |
| Glottolog Primary Key | art-328 | 38482 |
| UNESCO Atlas of the World’s Languages in Danger ID | art-329 | 425 |
| Ethnologue Language Names | art-330 | Cymraeg |
| Ethnologue Language Names | art-330 | Northern Welsh |
| Ethnologue Language Names | art-330 | Patagonian Welsh |
| Ethnologue Language Names | art-330 | Southern Welsh |
| Ethnologue Language Names | art-330 | Welsh |
| 普通话 | cmn-000 | 威尔士语 |
| 普通话 | cmn-000 | 威尔斯语 |
| Cymraeg | cym-000 | Cymraeg |
| Deutsch | deu-000 | Walisisch |
| English | eng-000 | Welsh |
| français | fra-000 | gallois |
| русский | rus-000 | валлийский |
| español | spa-000 | galés |