Comment by rootusrootus

The names are decided by the United States Board on Geographic Names, which is under the Department of the Interior, which is part of the executive branch. So yeah, he can make them rename it for the US. Sure, you can pedantically say that he can only force the entirety of the federal government to respect the name, and the State governments could refuse to abide by that, but what would be the point? AFAIK none have outright refused. And obviously private citizens can call things whatever the heck they want, though if they get too creative they may have trouble expressing themselves in a way that others will understand.