Edit unless I am missing something, only Westfalen and Westphalia are correct, it's original name and its english counterpart. (but ok, type- ins are often accepted, I guess I just find it a weird half and half mix, westfalia and westphalen)
(put ice in it)
Americans, Irish, the Swiss, Dutch, German, etc., had their favorite way of cooking potatoes (other than boiling), so why not the French?
UK is relatively a tiny island (or islands) compared to Europe.