It’s only Vidalia if it’s grown in the Vidalia region of France, otherwise it’s just sparkling onion.

Yeah thanksfully in Europe we have AOP / AOC (protected name of origin) so that names can have a meaning. Good that Vidalia farmers seem to have managed to do the same somehow.

Regarding Champagne, the funniest part is that Russia granted exclusivity of the name to some local sparkling wine, such that actual wines from the Champagne aera need to use some alternative names there ^^