I have just noticed that cover photo to ‘Atlas if the Moon’ Wood and Collins, shows both the impact crater and the volcano, designated Mairan T, both are shown together with their correct designation. I’m not sure who names features on the Moon, but giving the crater and the volcano much the same name is confusing. I also note the description inside the atlas that refers to the volcano with a crater on top, this could easily lead one to conclude the feature top most on the volcano is an impact crater, but that is not the case.
The Wikipedia article explains that nomenclature is set by the IAU and the convention for naming smaller scale features located close to the principle crater.
Perhaps it might be useful for you to review the article.