Tai Ya is a member of the Tai branch of the Kra-Dai or Tai-Kaidai language family. It is spoken mainly in Yunnan province in southern China, and also Chiang Rai province in northern Thailand. In the year 2000 there were about 50,000 speakers of Tai Ya in China, and in 2008 there were about 400 Tai Ya speakers in Thailand.
Tai Ya is also known as Tai-Cung, Tai-Chung, Daiya, Multi-colored Waistband Tai, Yuanxin Hongjin Dai, or 傣雅语 in Chinese. It was writen with a version of the Tai Tham / Lanna script, but this is no longer used. The orthography shown below is one way to write the language with the Latin alphabet.
Details of the Tai Ya alphabet provided by Wolfram Siegel
Information about Tai Ya language
Tai Ya in Thailand Present and Future: Reversing Language Shift
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