Vestibule

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early 17th century (denoting the space in front of the main entrance of a classical Roman or Greek building): from French, or from Latin vestibulum ‘entrance court’.

wiktionary

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Early 17th century, borrowed from French vestibule(“entrance court”), from Latin vestibulum(“forecourt, entrance court; entrance”), from vestiō(“to dress, clothe, vest”) +‎ -bulum(“place, location”, nominal suffix). Doublet of vestibulum.

etymonline

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vestibule (n.)

1620s, "a porch," later "antechamber, lobby" (1730), from French vestible, from Latin vestibulum "forecourt, entrance," of unknown origin. In reference to the ear part from 1728.