I don't think it is ever possible for a person who comes for bread to divide people.
And it is sad to see that this city has not yet developed and you guys have already started deciding on a name change like what happened in bangalore / bombay. Note that Bangalore / Bombay were better before the name changes happened.
If you are really cultured, it will show in the city irrespective of the name the city has. With these demands, you are actually showing your lack of culture.
Also, what do you mean by outsiders? were your forefathers in mangalore ever since the first human being was born? I think not. So, obviously, at some point, you are also an outsider.