also what-not, 1530s, "anything," from what + not. Elliptical for "what may I not say," implying "everything else." As the name of a furniture item, first attested 1808, so named for the objects it is meant to hold.
wharf
wharfinger
what
whatchamacallit
whatever
whatnot
whatsoever
wheal
wheat
wheatear
wheaten