How does the Chinese term Miao-Yao mix ethnic and linguistic classifications?

The designation "Miao-Yao" is a Chinese term that conflates ethnic and linguistic classifications by prioritizing the concept of "nationality" over strict linguistic boundaries. In China, this term is used to categorize groups based on a combination of political, cultural, and self-identification factors rather than purely linguistic relationships.1

This approach leads to significant discrepancies between ethnic labels and language families:

• Inclusion of diverse languages: The "Yao" nationality includes speakers of Mienic languages, but it also encompasses speakers of Bunu (a Hmongic language) and Lakkia (a Tai-Kadai language).1
• Exclusion based on culture: Conversely, speakers of the Mun language—which is linguistically Mienic—are classified as members of the "Miao" nationality in China due to cultural factors.1

Because the term "Miao-Yao" reflects these complex social and political groupings rather than a precise linguistic lineage, many Western scholars prefer the term Hmong-Mien to refer specifically to the language family and avoid the confusion inherent in the ethnic-based Chinese designation.1