Admittedly, a difficult term (for non-French speakers) that is often misspelled or mispronounced. The Ardèche Gorge and the Ardèche département (no. 07, which also appears on the licence plates of the people who live there) are spelled exactly like that. If you must, you can leave out the accent on the “e”. But please do not write “Ardesch” or “Ardesche” or “Gorsch de Ardesch”, or search for them in Google. In German phonetic spelling it is actually “Ardäsch” 😉
Otherwise you will find, at most, such funny websites as the one by Sachsen-Uli, where France is spelled “Frangreisch” (in Saxon dialect):