Etymology

From Middle French estuve, from Old French estuve. According to the Trésor de la Langue Française, from a Vulgar Latin *extupa, from a verb *extupāre, from ex- + *tupāre, from Ancient Greek τύφω ‎(túphō, “to smoke”). This word may have originally entered southern Gaul via Marseille before the Roman conquest.

Alternatively Old French estuve ‎(“room for steam baths”) derives from Medieval Latin *stuba (whence Occitan estuba), from Old Frankish *stuba ‎(“room, heated room”), from Proto-Germanic *stubō ‎(“room, heated room, living room”). Cognate with Old High German stupa, stuba (German Stube ‎(“room”)), Old English stofa, stofu ‎(“bathroom, bathhouse”), Old Norse stofa (whence Icelandic stofa ‎(“living room”) and Danish and Norwegian stue). More at stove.