08/30/2026
The argument over Lake Ontario’s name gets especially interesting once you realize the word “Ontario” was around centuries before either modern Canada or the United States existed.
Canadian government sources trace the name to an Indigenous Iroquoian linguistic origin, although the precise translation varies between references from “sparkling water” to “vast body of water.”
Prime Minister Mark Carney pointed to the Wendat form “Ontari’io” today and said the name is more than 400 years old.
The name was already being recorded in the 1600s, long before the international border through the lake was established and long before Ontario became a province in 1867.
President Donald Trump signed an executive order today directing U.S. federal agencies to replace “Lake Ontario” with “Lake America” in American federal geographic records within 30 days.
That order governs U.S. federal naming practice and does not require Canada to adopt the new name.
Canada’s official geographical names database continues to list the shared body of water as Lake Ontario and Lac Ontario.
So beneath today’s political theatre is a much older story about Indigenous language, European mapmaking and a name that survived empires, borders and Confederation.
(Source: Natural Resources Canada, Canadian Heritage, Geographical Names Board of Canada, The White House, Reuters)
