I get that the renaming of the lake from the US perspective is annoying. Yet, it remains whatever Canada wants to call it on their side.

Geographical place-names get renamed all the time. It’s not extraordinary. You can search for recently renamed place names in Canada. There are quite a few. Canadians don’t get upset over it. Even in the US there is a constant renaming of places, roads, parks and schools. No one gets mad that mapping services update them promptly or that places get renamed…