It just occurred to me that Boeing has been quite successful with branding ("Dreamliner", "MAX"), but maybe wishes it hadn't been... Everyone now knows that MAX is bad, but how many people can tell the difference between a 737-8 and a 737-800?
Boeing still may rebrand the plane and stop calling it the MAX, as you say it was only ever a marketing name. The plane is certified as the “737-8”, “737-9”, etc.