The name change is the result of an executive order from the White House, as President Trump bickers with Canada over trade tariffs. In response, Canadian authorities have installed a large new sign at the lake (via the BBC), reading 'Lake Ontario. Now and Always'.

https://www.techradar.com/computing/internet/beyond-ridiculous-if-youre-seeing-lake-ontario-renamed-as-lake-america-on-google-maps-heres-why