I have heard both she von and she vawn-- as a pronouncation--I am not sure which is more correct--

Its like the Irish name Deirdre some pronounce dear dree some dear dra-- In our house is was always the latter for both names-- but my parents are not from a gaelic speaking part of the country-- and only knew as much gaelic as they had learned in school. (and since my mother had few than 5 years of schooling..that was very little)