Other information?
Well, the pronunciation ee-VON is French and is the original pronunciation. Ya-von is American and less common and originated with people who didn't know how to pronunce
Yvonne properly.
I've known enough Ya-vonnes that it's not a new habit, though.
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"What are these parents thinking?...Let's name her Madison--she'll live in her own world: 16 square miles surrounded by reality." -- Susan Lampert Smith