Ethnologue distinguishes the following languages:1
(See varieties of Zhuang.)
Yoy is elsewhere classified as Southwestern Tai, and E, which is a mixed language Northern Tai-Chinese language.
Longsang Zhuang, a recently described Northern Tai language, is spoken Longsang Township, Debao County, Guangxi, China. Hezhang Buyi is a moribund Northern Tai language of northwestern Guizhou that is notable for having a Kra substratum.
Pittayaporn (2009:300) distinguishes a similar group of Zhuang varieties as group "N", defined by the phonological shifts *ɯj, *ɯw → *aj, *aw.3 He moves the prestige dialect of Zhuang, the Wuming dialect, from the Northern Tai Yongbei Zhuang to Yongnan Zhuang – purportedly Central Tai – as it lacks these shifts. The various languages and localities Pittayaporn includes in group N, along with their Ethnologue equivalents, are:
Some examples of lexical and phonological differences between Northern Tai and Central-Southwestern Tai:4
"Tai-Kadai, Kam-Tai, Be-Tai, Tai-Sek, Tai". Ethnologue. Archived from the original on 2012-10-18. Retrieved 2011-11-30. https://web.archive.org/web/20121018143636/http://www.ethnologue.com/show_family.asp?subid=841-16 ↩
Pittayaporn classified Yoy as Southwestern Tai, but does not provide supporting analysis. /wiki/Southwestern_Tai ↩
Pittayaporn, Pittayawat (2009). The Phonology of Proto-Tai (Ph.D. thesis). Cornell University. hdl:1813/13855. /wiki/Hdl_(identifier) ↩
Norquest, Peter (2021). "Classification of (Tai-)Kadai/Kra-Dai languages". In Sidwell, Paul; Jenny, Mathias (eds.). The Languages and Linguistics of Mainland Southeast Asia. Berlin: De Gruyter Mouton. pp. 225–246. doi:10.1515/9783110558142-013. ISBN 978-3-11-055814-2. 978-3-11-055814-2 ↩