Hölzl (2021) shows that Caijia, Longjia, and Luren are all closely related to each other as part of a linguistic group that he calls Ta–Li or Cai–Long.[7]
Bai has over a million speakers, but Longjia and Luren may both be extinct, while Caijia is highly endangered with approximately 1,000 speakers. The Qixingmin people of Weining County, Guizhou may have also spoken a Macro-Bai language, but currently speak Luoji.
Similarities among Old Chinese, Waxiang, Caijia, and Bai have been pointed out by Wu & Shen (2010).[8]
Gong Xun (2015) notes that Bai has both a Sino-Bai vocabulary layer and a non-Sinitic vocabulary layer, which may be Qiangic.[9] Gong also suggested that the Old Chinese layer in Bai is more similar to early 3rd-century central varieties of Old Chinese in Ji, Yan, Si, and Yu that display the phonological innovation from Old Chinese *l̥ˤ- > *xˤ-, than to the eastern Old Chinese varieties (i.e. Qingzhou and Xuzhou, etc.) that later impacted Middle Chinese, which show OC *l̥ˤ- > *tʰˤ- > MC th-. This east-west dialectal division in Old Chinese has also been noted by Baxter & Sagart (2014:113-114).[10]
^ abZhèngzhāng Shàngfāng [郑张尚芳]. 2010. Càijiāhuà Báiyǔ guānxì jí cígēn bǐjiào [蔡家话白语关系及词根比较]. In Pān Wǔyún and Shěn Zhōngwěi [潘悟云、沈钟伟] (eds.). Yánjūzhī Lè, The Joy of Research [研究之乐-庆祝王士元先生七十五寿辰学术论文集], II, 389–400. Shanghai: Shanghai Educational Publishing House.
^Guizhou provincial ethnic classification commission, linguistic division [贵州省民族识别工作队语言组]. 1982. The language of the Caijia [Caijia de yuyan 蔡家的语言]. m.s.
^ abGuizhou provincial ethnic classification commission [贵州省民族识别工作队]. 1984. Report on ethnic classification issues of the Nanlong people (Nanjing-Longjia) [南龙人(南京-龙家)族别问题调查报告]. m.s.
^Guizhou Province Gazetteer: Ethnic Gazetteer [贵州省志. 民族志] (2002). Guiyang: Guizhou Ethnic Publishing House [貴州民族出版社].
^"白族家园-讲义寨". 222.210.17.136. 2011-01-28. Archived from the original on 2014-10-17. Retrieved 2013-11-27.