In modern (or American) ENglish, we simplified spellings of many words, such as plough, mould, neighbour, and many many more. Why don't we do same thing for word "champagne"?
closed as primarily opinion-based by Mari-Lou A, NVZ, MetaEd♦, sumelic, Phil Sweet Jul 15 '16 at 19:37
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Because Champagne is the name of the region in France where the sparkling wine comes from. You don't just change the names of people or places without their consent.
In most cases Champagne the drink must come from Champagne the place to be called that. In those places where this is not the case, nobody will put 'champen' on their bottles as it would be a very easy way to tell the knock-off from the original.