Google has confirmed it will display both Lake Ontario and Lake America to countries outside the US and Canada in its Maps.
Those in the US will be the only ones to see the full change, while users in Canada will continue to see Lake Ontario.
The change follows an executive order signed by Donald Trump, renaming the lake amid a trade war with Canada.
Trump signed the order in the Oval Office, directing the Interior Department to change the lake's name in the US' Geographic Names Information System. A large map of the Great Lakes was displayed during the signing, with Lake Ontario relabelled in red as "Lake America".
Google said in a statement that it updates Maps to "reflect name changes in official government sources, which is GNIS for the US".
"These updates follow our long-standing policy for bodies of water with names that vary from country to country, and are starting to roll out now," the company said.
While Trump holds power over how the US names geographic landmarks, he cannot force the rest of the world to do the same.
Ontario Premier Doug Ford responded Sunday with a billboard reading "Lake Ontario. Now and Always".
The dispute comes as relations between the US and Canada have weakened. Trump imposed a 50% tax on US$20 billion worth of Canadian goods after trade talks between the countries broke down, then Canada responded with retaliatory tariffs on American goods.
Lake Ontario, the smallest of North America's Great Lakes, sits on the border between the US and Canada.
Canadian Prime Minister Mark Carney highlighted the Lake's indigenous roots predating the signing of both the Canadian Confederation and the US Declaration of Indepencence. The word "Ontari'io" is an indigenous Wendat term meaning "the lake is beautiful, the lake is big", he wrote on social media.
This isn't the first time Trump ordered changes to the map. A similar situation happened last year when the Gulf of Mexico was renamed the Gulf of America.
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