OK I looked at the site and noted the team is not called the NC Panthers, it is called the Carolina Panthers.<quoted text>
Mike, looks like the stadium got help from "citizens" of North and South Carolina. No mention of how much, if any, the state of NC helped. You be the judge:
I am betting people are adding the NC just because it is in NC, but it does not look to be the official name. One cannot control what people do outside the official realm.