Apparently one of the ideas on the origin of the name "Canada" is that it is in fact Spanish: "The Spanish came to Canada about the time it was discovered by Cabot (1497), and finding there nothing but a desert and ice-bound mountains, instead of the gold fields for which they sought, they withdrew crying out meanwhile: Acá nada! Here nothing!..." A. Marshall Elliot, "Origin of the Name Canada," in Modern Language Notes 3: 6 (1888), 328.
I don't think it's the origins, I believe it came from the name Donnacona or one of his fellow Iroquois told Cartier on his first voyage. Anyone else know any of the other theories?