@Voy Kay The very terms Flamand and Walloon strike the English ear as funny. I like it when serious things have somewhat silly names, it's fun and punctures our pomposity. England is full of odd place names, we have many here in the U.S., with goofy demonyms to match (Hoosiers?). And for odd place names, Australia takes the prize (Humpybong? Dismal Peak? Mount Bugger? Eggs-and-bacon Bay? a Google search will provide hours of entertainment).
Speaking of Belgium, many years ago in college we had an exchange student, Orlane, from Liège. I was smitten, and did my very 18-year-old best to catch her eye, to no avail. Probably worked out for the best, but my, was she pretty. We had German 101 together, and she grew irritated with it because she claimed it was messing up her Flemish pronunciation terribly. I say irritated, but she was nothing ever but unfailingly polite and cheerful.