proper noun
Grand Isle: a barrier island in Jefferson parish, Louisiana, United States, on the coast of the Gulf of Mexico; Grand Isle: a town in Jefferson parish, Louisiana, United States; Grand Isle: an island of Grand Isle County, Vermont, United States in Lake Champlain; Town of Grand Isle: a town in Grand Isle County, Vermont, United States, on the eponymous island; Grand Isle County: a county of Vermont, United States, named after the eponymous island; county seat: North Hero
Borrowed from English Grand Isle, from Middle French Grande-Isle. * (Louisana): From Cajun French Grand Isle