Lanefan
Victoria Rules
More seriously, ketchup is an example of where what was once a brand name has become common parlance for the product in question, much like kleenex has for a tissue. This is relevant today in that one could maybe argue that "dungeons and dragons" has become common parlance for tabletop role-playing games in general; and if that's the case WotC's claims to ownership of the name lose a lot of steam.