The name doesn't offense me personally, but I can sure as hell see how it would offend a native American in a HUGE way.
It really should be changed tbh. If they can change the "Washington Bullets" they can sure as hell change the Redskins.
They can keep it within the theme but under a new name. Washington Tribe or something similar.
In the end, I'm gonna hate them either way so I guess it doesn't matter (from my point of view anyway).