| Abbreviation | Definition |
|---|---|
| YHD | Judeo-Iraqi Arabic: a language of Israel |
| YID | Yiddish |
| YIJ | YINDJIBARNDI: a language of Australia |
| YIY | Yoront: a language of Australia |
| YKA | Yakan: a language of Philippines |
| YKG | Northern Yukaghir: a language of Asian Russia |
| YKI | Yoke: a language of Irian Jaya, Indonesia |
| YKO | Yasa: a language of Cameroon |
| YKY | Yakoma: a language of Central African Republic |
| YME | Yameo: an extinct language of Peru |
| YND | Yandruwandha: a language of Australia |
| YNK | Naukan: a language of Asian Russia |
| YNN | Yana: an extinct language of U S A |
| YNU | Yahuna: an extinct language of Colombia |
| YOR | Yoruba: a language of Nigeria |
| YRI | YARÍ: a language of Colombia |
| YRK | Nenets: a language of Asian Russia |
| YRM | YARUMÁ: a language of Brazil |
| YRW | Yarawata: a language of Papua New Guinea |
| YUC | Yuchi: a language of U S A |