Hi Annie, if the name depends on your IP address, it is difficult to think of an alternative to using a VPN if you plan to use the service directly. There is a free version of Proton VPN you could look at, but it's not clear from the description how the country is selected (https://protonvpn.com/free-vpn).

There might be an indirect method to access the map using a remote computer to request the site. There are some services for developers that provide use of a variety of browsers installed on remote computers, but I don't know whether you can choose your country to view from.

Oh for... not sure how long it has been changed as it was more recent but even on https://www.google.ca/maps/ they now have mention of Gulf of America for the international body of water though they are doing it as "Gulf of Mexico (Gulf of America)" on the map.