On the Gulf of Mexico/Gulf of America: Might the nat_name:en-US tag be appropriate?
Also, the “Gulf of America” name has now been used by Florida’s state governor in an executive order declaring a state of emergency relating to the weather: NOTE TO PRESS: EXECUTIVE ORDER NUMBER 25-13 (Emergency Management-Gulf Winter Weather System) | Executive Office of the Governor
Trump’s EO is here: Restoring Names That Honor American Greatness – The White House