My one time boss, a U.C. Berkeley graduate, would say “wolla” for “voila”, and “another words” for “in other words”, among many such malapropisms that I should of thought of jotting down.
Oh, there are many other possibilities for misspelling voilà! I've seen wallah, wahlah, wa la, waalaa, whala, whalaa, and whoala, as well as the ever-popular musical instrument. Yes, I started keeping a list three or four years ago.
The most recent find is voile. Mental picture of someone pulling a screening piece of fabric away to show the hidden object.