I think we’re all agreed keeping the North Stand name after the North stand expansion really isn’t appropriate. “We are the North stand!”(arf!)
The sensible thing to do is to let the fans chose from a list of stand names. Say 4 or 5 names? If the voting is close on 2 of the names, whittle it down and let the fans pick either of those 2 names. If there‘s a clear fans favourite, the club should go with that name.
PS. I honestly thought City were going to name the North stand the Sergio Aguero stand when Sergio retired. The North stand will always be remembered as the end where Sergio scored that famous PL title winning goal. :-)