I remember reading something from Thomas Jefferson about having potatoes served "in the French style", although I've read that the origin is the French speaking regions of what is now Belgium. French Toast has been around since Roman times, although the name we use comes from England (not sure if they use it still, but that was what they called in in the colonial era). There is a semi-popular story about French being the name of the guy who reintroduced it to the English speaking world, but it is probably just a story.