I agree with your speculation Mike, if you do know the tribe that is great. But trying to figure out the difference of Southern Ute or Mountain Ute can be a problem, so usually Ute would work. Sometimes I have been chastised for saying Indian, but as many have said to me they were born in America so they are Native Americans, and because I was born here I too am a Native American. But these same people call themselves Indians, but then again if they do not feel that you are using Indian in a negative tone they seem to be OK with it.