Classic problem in Paris: you constantly find (well, out of Covid...) baffled travellers (mostly Asian) lost with their suitcases at the Charles-de-Gaulle-Étoil

Classic problem in Paris: you constantly find (well, out of Covid...) baffled travellers (mostly Asian) lost with their suitcases at the Charles-de-Gaulle-Étoile subway station. They're looking for the Roissy-Charles-de-Gaulle airport, 50 km away... Unfortunately the RER (suburban train) station names aren't distinct enough.