The solution is to name everything after white people. We don’t mind. I have Ulster Scot ancestry and I think I can speak for all of us in saying that we would be proud to have an Ulster Scot Nebula. Same for the sports teams. The Washington Ulster Scots. Sounds good. There are plenty of white people names to go around. You could have the Atlanta Walloons, the Cleveland Moravians, etc.
You might be on to something there. If they refuse to be honored by being named by sports teams, name the teams after European groups, including various tribes and ethnicities of old Europe: the Franks, the Saxons, the Vandals (double meaning there), the Sorbians, the Etruscans, etc. You could have some cool outfits too.