Yvonne is trashy and dated? Dated, perhaps, but trashy? I've never heard or thought of it that way. Huh. (I'm in the U.S., if that makes a difference.)
I grew up watching a lot of tennis and Australian
Evonne Goolagong Cawley (sp?) was a favorite. While I prefer the
Evonne spelling, the
Yvonne one is more ocmmonly used and so I could see using it over
Evonne.