The Redskins, Chiefs and Braves have all come under fire at various times for their names, all of which have negative connotations to Native Americans. FYI, "Chief," while a term of status
within the community, has been used
outside the community in much the same way as "boy" is for blacks- a term of belittlement.
The Indians get in trouble for their iconography, chants & hand chop stuff.
However, the Seminoles, from what I understand, have not had much of a problem with protests. Apparently, the tribe itself doesn't find the use of their name as a team name as offensive.
Similarly, I don't think the Chicago Blackhawks have had many problems with it either.
I'm pretty sure that if they adopted a name a tribe used for themselves- possibly with a marketing agreement- there would be no problem at all.
Check here:
http://www.fortunecity.com/victorian/ferndale/61/tribes.htm
and you'll see there are tribal names all over our culture, especially in commercial products like vehicles.