The term "Tai Ya language" does not correspond to a widely recognized or established language in major linguistic databases or academic references, including Ethnologue, Glottolog, or UNESCO's endangered languages list. Accurate information is not confirmed regarding a distinct language by this name.
It is possible that "Tai Ya" may be an alternate or local name for a lesser-known dialect within the Tai language family, which includes languages such as Thai, Lao, Shan, and various Northern Tai languages spoken in southern China, northern Vietnam, Laos, and Thailand. Some Tai languages have multiple exonyms or local designations that may not be standardized in academic literature.
Without reliable sources confirming the existence, classification, or linguistic features of a language specifically known as "Tai Ya," the term remains unverified. It may also be a misspelling, misrendering, or confusion with similarly named languages such as Tai Yai (another name for the Shan language) or Tai Dam (Black Tai).
In summary, "Tai Ya language" is not currently recognized as an established linguistic entity in available scholarly resources. Further field research or authoritative documentation would be required to verify its status.