Answer box
Lake America is official in U.S. federal naming systems. Canada has not adopted the name, while private platforms make their own labeling choices. An executive order signed Aug. 27, 2026 directed U.S. agencies to use it for the lake their records had called Lake Ontario. Canada continues to use Lake Ontario in its own databases. Google Maps and Apple Maps show Lake America to users in the United States and Lake Ontario to users in Canada; MapQuest said it would keep Lake Ontario everywhere. There is no single worldwide authority that could make one label official for everyone.
Official where?
Four different record-keepers, four different answers — each dated and sourced below.
U.S. federal government
Official — Lake America
The executive order of Aug. 27, 2026 directs federal agencies and the Geographic Names Information System, the database other U.S. agencies and many private data products read from, to use Lake America.
Canada
Not official — Lake Ontario
Canadian federal and provincial geographic name databases continue to list Lake Ontario. A U.S. domestic naming directive carries no authority in Canadian systems.
Private map platforms
Varies by user location
Google Maps and Apple Maps show Lake America to users in the United States and Lake Ontario to users in Canada. MapQuest said it would keep Lake Ontario everywhere. No platform is bound by the order.
International context
No single global answer
Geographic naming on a shared border feature is settled jurisdiction by jurisdiction, not by one global registry. Where a platform shows both names, that is the platform reflecting the split rather than resolving it.
What “official” can and cannot mean here
A national naming database is an internal record, not a treaty. When one country updates its own entry for a shared border feature, nothing obliges the other country, an international body or a private company to follow. That is the whole mechanism behind the split — no dispute about the geography, only about which register you are reading.
The practical test is simple: ask whose record you are looking at. A U.S. federal page, a phone set to the United States, and a Canadian government database can each be accurate and still disagree.