Old Yue language
The Old Yue language (Chinese: 古越語; pinyin: Gǔyuè yǔ; Jyutping: Gu2 Jyut6 Jyu5; Pe̍h-ōe-jī: Kó͘-oa̍t-gí / Kó͘-oa̍t-gír / Kó͘-oa̍t-gú, Vietnamese: Tiếng Việt cổ) is an unattested, unclassified language, or group(s) of various languages, spoken in ancient southern China, and northern Vietnam circa 700 BCE or later. It can refer to Yue, which was spoken in the realm of Yue during the Spring and Autumn period. It can also refer to the different languages spoken by the Baiyue. Possible languages spoken by them may have been of Kra–Dai, Hmong–Mien, Austronesian, Austroasiatic and other origins. Knowledge of Yue speech is limited to fragmentary references and possible loanwords in other languages, principally Chinese.