The president is the government as far as assigning or altering place names is concerned, but only for names not established by an act of Congress. That's why

The president is the government as far as assigning or altering place names is concerned, but only for names not established by an act of Congress. That's why Trump was able to change the name of Denali back to Mount McKinkley; he was simply reversing an Obama-era executive order. But he couldn't rename Denali National Park because that was established by Congress.