Is there a term for brand names that evolve into generic use?

Brand names like Kleenex, Xerox, Band-Aid, and Hoover have become a generic term by the general population. I thought that there was a specific term for this, but haven’t been able to locate an answer on the internet.

Is there such a term? Metonymy seems to come close, but I don’t think that was it. If not, can you think of a good one? And do you have any examples of brand names gone generic?