"Mario Mario" is an anachronism. He and his brother were only ever referred to by mononyms in their lifetime, like most residents of the Mushroom Kingdom at the time - multi-part names were typically reserved for members of the Toadstool dynasty, and even these were more like titles or Roman cognomina than what we would call a surname today. His putative ennoblement as founder of the "House of Mario" came centuries later as the collapsing feudal order sought additional sources of legitimacy
#mushroom kingdom folklore says that he sleeps beneath a warp pipe to arise in the time of the kingdom's greatest need #he's definitely shown up a few times but it's hard to tell if he has risen from the dead or is just in the middle of some time travel shit #historians hate him.
While the historical evidence for Mario having a younger brother is quite concrete, the name of said brother is less certain. "Luigi" is generally held to originate with a separate figure from a series of chthonic myths, who originally served as a sort of psychopomp charged with capturing spirits that escaped the underworld. The strongest case for a contemporary figure named Luigi comes from the Waffle Kingdom sagas; however, this Luigi's brother is a gladiator named Gonzales.
