I just looked up the Dai people...they are also know as the Thai Lu in Thailand...one sub group is the Thai Yong, "Tai Yong are thus descendants of the Tai Lue. In Thailand, these people are know as Thai Yai (Big Thai) and by the rest of the world as Shan."
http://en.wikipedia.org/wiki/Dai_people
http://en.wikipedia.org/wiki/Shan_people
http://en.wikipedia.org/wiki/Jingpo