The Indigenous peoples called it Bakudabakek (Mi’kmaq) or Wekwabegituk (Wolastoq), meaning "open way" and "waves at the head of the bay," respectively. However, these aren't the origins of "Fundy."
Some suggest "Fundy" comes from "Fond de la Baie" (French for "head of the bay"), but historian William F. Ganong disagreed.
In 1604, French settlers led by Champlain named it "La Baie Françoise" after
rejecting Champlain's choice of "Norumbega." The name "Fundy" might stem from an earlier Portuguese explorer, Fagundes, who labeled it "Gram Baya" or "Rio Fondo," later misinterpreted and evolved into "Fundy."
This mix-up wasn't uncommon. Verrazzano named the whole region "Arcadia," meaning "paradise" in Greek. Champlain later removed the "R," possibly by mistake, leading to the creation of the word "Acadia." Similarly, the evolution of "Rio Fondo" into "Fundy" followed a
series of errors and reinterpretations.