On August 27, 2026, U.S. President Donald Trump signed an executive order directing American federal agencies to call Lake Ontario “Lake America.” It was the latest political renaming exercise from an administration that had already replaced “Gulf of Mexico” with “Gulf of America” in U.S. federal usage.
Trump can tell agencies under his authority what wording to place in American databases and on American federal maps. What he cannot do is rename the Canadian portion of an international lake, alter Canada’s official geographical records or force the rest of the world to accept his preferred label.
Lake Ontario remains Lake Ontario in Canada—and its name carries far more history than the stroke of any president’s pen.
Where did the name Lake Ontario come from?
The name Ontario did not originate with the Province of Ontario. In fact, the lake had the name long before the province existed.
The word is Indigenous in origin. Exact spellings and translations vary because Europeans recorded words from oral languages using different spelling systems. The name is generally traced to an Iroquoian language—often identified as Wendat or Haudenosaunee—and rendered in forms such as Ontarí or kanadario. It has been translated as “beautiful lake,” “great lake,” “sparkling water” or “lake of shining waters.” The Canadian Encyclopedia describes the name as Iroquoian in origin and gives “beautiful lake” or “sparkling water” as likely meanings.
That history matters. The name is not merely a label chosen by a modern Canadian government. It preserves a connection to the Indigenous peoples who knew, travelled and named these waters long before the international border divided the lake.
Lake Ontario’s name is older than both countries
European explorers and mapmakers tried several names for the lake. At different times, French sources used names including Lac de St. Louis, Lac Frontenac and Lac Ontario. By the 17th century, variations of Ontario were already appearing on European maps.
The province did not officially become Ontario until Canadian Confederation in 1867. The United States declared independence in 1776. Therefore, the lake’s Ontario-derived name predates both modern countries—and certainly predates Donald Trump—by generations.
Prime Minister Mark Carney made the same basic point when rejecting Trump’s announcement: the name has been used for more than 400 years and predates both Confederation and the U.S. Declaration of Independence. Reuters reported Carney’s response, while the Library of Congress documents the much broader history of how the word America appeared on European maps.
Can Trump legally rename Lake Ontario?
Only in a limited American administrative sense.
Trump’s executive order directs the U.S. Department of the Interior and other federal agencies to use “Lake America” in American federal records. The U.S. Board on Geographic Names standardizes names used by departments and agencies of the U.S. government. Its decisions do not give the American president authority over Canadian records, Canadian maps or Canadian territory. The U.S. Geological Survey explains that the board’s decisions are binding on American federal departments and agencies—not on foreign governments.
Canada has its own naming system. Official Canadian place names are maintained through the federal, provincial and territorial authorities that make up the Geographical Names Board of Canada. Natural Resources Canada’s official place-name service continues to recognize Lake Ontario.
In plain language, Trump can order his own government to print a different name. He cannot:
- rename the Canadian portion of Lake Ontario;
- compel Ontario or Canada to adopt the new name;
- rewrite Canadian maps, laws, schoolbooks or databases;
- force international organizations or other countries to use it; or
- erase the Indigenous and historical origin of the name Ontario.
The Associated Press likewise described the order as applying within U.S. federal usage and having no effect on Canada’s naming rights.
Lake Ontario is not an inland lake contained entirely within New York State. The international boundary runs through it, with Ontario on the north and west and New York on the south and east.
For more than a century, Canada and the United States have managed shared waters through co-operation rather than unilateral declarations. The Boundary Waters Treaty of 1909 was created to prevent and resolve disputes involving waters shared by the two countries. It established the International Joint Commission, with equal Canadian and American participation.
That arrangement recognizes an obvious fact: one country does not own the whole lake. A president in Washington has no more authority to rename Canada’s side of Lake Ontario than a Canadian prime minister has to rename Rochester, New York.
“America” is bigger than the United States
The proposed name “Lake America” also exposes a long-standing habit in U.S. language: treating America as though it belongs exclusively to the United States.
Canada, the United States and Mexico are all countries in North America. Central America is generally treated in English-language geography as the southern region of North America, while South America is a separate continent. In some countries and education systems, North and South America are taught together as one continent called America. Either way, the word has a geographic meaning far broader than a single country.
This does not mean that calling the United States “America” is technically forbidden. It is a deeply established short form in English, and American is the standard English demonym for a citizen of the United States. However, familiar usage is not exclusive ownership. Canadians, Mexicans, Brazilians, Jamaicans and Argentinians all live in the Americas.
Naming a shared lake “Lake America” as an assertion of U.S. identity is therefore oddly self-defeating. If the name is meant geographically, Lake Ontario was already in North America. If it is meant to claim the lake symbolically for the United States, it ignores Canada and the international border.
How original is the name “United States of America”?
To be fair, the name was descriptive rather than imaginative. Thirteen former British colonies declared themselves free and independent states and formed a union. The U.S. National Archives records Richard Henry Lee’s 1776 resolution declaring that the “united colonies” ought to be “free and independent states.” The Articles of Confederation later stated that the union’s formal style would be “The United States of America.”
In other words, the founders selected a practical description: states united in the part of the world Europeans called America. They did not invent the word America, and their new country did not include all of the Americas.
Nor is “United States” unique to their federation. Mexico’s formal constitutional name is the United Mexican States, as confirmed by the Embassy of Mexico. History contains plenty of republics, unions, federations and collections of states. The American founders chose a functional name that explained what their new political union was—not an exclusive deed to an entire hemisphere.
So yes, there is room for a little Canadian humour here: perhaps the founders were better revolutionaries than brand consultants. But the more important point is that a country called the United States of America does not own the word America, the continent or every geographic feature touching its border.
A political stunt cannot erase centuries of history
The renaming of Lake Ontario appears less like serious geographic policy and more like a political provocation aimed at Canada during a worsening trade dispute. It transforms a shared natural feature into a prop for nationalist messaging.
That is precisely why the history of the original name deserves attention. Ontario survived competing French colonial names, the fall of New France, British rule, the War of 1812, Confederation and more than two centuries of Canada–U.S. relations. It is rooted in an Indigenous language and in the geography and memory of the region itself.
An executive order may change the words displayed in an American federal database. It does not change the lake, the border, Canadian sovereignty or history.
For Canadians, it is still Lake Ontario.
For anyone interested in accuracy, history and respect for shared geography, it should remain Lake Ontario.
And if Washington insists on calling it “Lake America,” Canadians are entitled to point out that Canada is already part of North America—so even that name does not mean what Trump appears to think it means.
My personal view is that this renaming attempt is childish and needlessly disrespectful to Canada and the Indigenous Of North America. Donald Trump is free to direct the agencies of his own government, but he is not the president of Canada and does not have the authority to rename our land or our waters. Lake Ontario’s name is older than both of our countries and comes from Indigenous history. That deserves more respect than a political stunt.
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