I'm Alaska Native, was adopted out and spent a good part of my childhood on an Oregon Indian Reservation.  Chief Wahoo and the team's name, "Indians" doesn't bother me a bit.  Attack helicopters and lots of other things are named after American Native tribes and persons ... often to appropriate the historically incorrect "fierce Image" first made popular by "Dime Novelists".  I do think though that the "Indians" could make some effort to recruit some real Indians to their team.  Without some real Indians, they are guilty of false advertising.
If some wealthy person decided to start an all American Native team, they could be called "Palefaces".