What country is that city in?
Well, because last time an army marched across that border burning cities, it came from Canada into the US, and they burned all the way to Washington DC. So by your logic, it's entirely up to Canada what it should be called.
Historically there is no reason why the US can't call a lake (owned by it or not) whatever it wants.
Other countries will call it what's most convenient (if there is an disagreement they side with whom they are allied or who is stronger in the conflict(Constantinople example)).
People trying to make this a big thing are playing mercenaries for whatever political party is pro or against this. I thing this is a stupid thing to do but making it more than it is wrong, when you have something like the Epstein files people conveniently don't talk about anymore.
Ignoring that your mad king did this specifically because he's an emotionally immature geriatric toddler and had a war of words with the Premier of Ontario, and that the renaming was 100% targeting Canada[1]...
...this wasn't like the US had some drawn out process when the electorate made their voices heard that what really ails the nation is the 400 year old name of a great lake -- older than the province that was then named in its honour --named by a word from of the aboriginal tribes that lived in the area surrounding the lake. No, this was a tantrum from one very foolish, grotesque convicted rapist, who unilaterally, with absolutely no one to stop his idiotic gestures and actions, decided to rewrite the map, and hundreds of millions cluck and say "yes massa!"
I mean...any other nation would be outraged. Like, this is bizarre fascist dictator shit. In the US, who for decades schooled the world on democracy and checks and balances and responsible government, it's just another day where the foolish tyrant does stupid bullshit.
I kind of get why a weak, pathetic firm like Google immediately choked on his micro-dick -- your corrupt government will try to punish any company that doesn't -- but if they had any credibility they would have decoupled from the tantrums of a foolish clown by now. They already learned how embarrassing it is, and came back for more. Disgusting and embarrassing. If Trump tomorrow renames California to "Libtardland", will Google immediately retitle the maps? I mean, Trump has loyal Myrmidons installed throughout government who'll instantly change every database. If Apple actually holds out against Trump, maybe he'll rename Cupertino to Disloyalville. Will Google be facile pathetic servants and instantly change it?
[1] Trump and his cabinet of criminals and greaseballs continually repeat how little Canada matters, how tiny and insignificant we are, etc, while endlessly flapping their disgusting mouths about us. These foolish idiots just cannot stop talking about us, constantly, 24/7.