To the points made by RR alums, I agree that most if not all would feel honored by UND using the name; not insulted. Not to mention, if the standard is to avoid using a nickname that's already used by another institution, then 99% of the other colleges and universities should change their names.
Colorado College makes no bones about it that they picked Tigers because they wanted to give the impression that they were the "Princeton of the west." Yet, today I don't hear cries for CC to come up with a new nickname.