| Name | Other Name | Family | Nativ Name | ISO6391 Code | ISO6392T Code | ISO6392B Code | ISO6393 Code | Notes |
|---|---|---|---|---|---|---|---|---|
| Zulu | Niger–Congo | isiZulu | zu | zul | zul | zul | ||
| Chinese | Sino-Tibetan | 中文 (Zhōngwén); 汉语; 漢語 | zh | zho | chi | zho + 13 | macrolanguage | |
| Zhuang | Chuang | Tai–Kadai | Saɯ cueŋƅ; Saw cuengh | za | zha | zha | zha + 16 | macrolanguage |
| Yoruba | Niger–Congo | Yorùbá | yo | yor | yor | yor | ||
| Yiddish | Indo-European | ייִדיש | yi | yid | yid | yid + 2 | macrolanguage. Changed in 1989 from original ISO 639:1988; ji. | |
| Xhosa | Niger–Congo | isiXhosa | xh | xho | xho | xho | ||
| Wolof | Niger–Congo | Wollof | wo | wol | wol | wol | ||
| Walloon | Indo-European | Walon | wa | wln | wln | wln | ||
| Volapük | Constructed | Volapük | vo | vol | vol | vol | constructed | |
| Vietnamese | Austroasiatic | Tiếng Việt | vi | vie | vie | vie |