I think there are good reasons to prefer "Lake Léman". The lake is split between France and French-speaking part of Switzerland. In French, the name is Léman.

I think there are good reasons to prefer "Lake Léman". The lake is split between France and French-speaking part of Switzerland. In French, the name is Léman. I do think using the local name is better, even more when this local name is acknowledged (en.wikipedia shows both Geneva and Léman). To me, born and raised in Romandy, "Lake Geneva" feels like "Tokyo Country" for Japan or "California Ocean" for the Pacific.