The Kam-Sui peoples are a group of related ethnic groups in China and neighboring portions of northern Laos and Vietnam. They are defined as speakers of Kam-Sui languages, which belong linguistically to the Kradai language family, rather than genetically.
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Kam-Sui of China
Cao Miao people
The Cao Miao people of Guizhou, Hunan and Guangxi Provinces speak a Kam-Sui language called Mjiuniang, although it is believed that the people are of Hmong-Mien descent.
Biao people
Whether or not the Biao people of China are of Kam-Sui descent is an issue of present debate in the scientific community. They are, however, a Tai ethnic group.
Kang people
The Kang people of Yunnan Province (referred to as Tai Khang in Laos) speak a Kam-Sui language, but ethnically descend from the Dai people.
Kam-Sui of Vietnam
The following Kam-Sui ethnic groups originating in China have population clusters in Vietnam:
Tai Khang people of Laos
The Tai Khang people of Laos (referred to as Kang in China) speak a Kam-Sui language, but ethnically descend from the Dai people.