Kuan (Guan) is a
Tai language
The Tai or Zhuang–Tai languages ( th, ภาษาไท or , transliteration: or ) are a branch of the Kra–Dai language family. The Tai languages include the most widely spoken of the Tai–Kadai languages, including Standard Thai or Si ...
of
Laos. It is not easily classified within Tai, possibly due to migration.
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References
Southwestern Tai languages
Languages of Laos
{{tk-lang-stub