I don't really think it's bimbo-ish, esp. since there are so many of us now. Like so many other overused names, it has a very different image for almost everyone, instead of something like, say,
Edith or
Winifred. :b But for years, it was seen as a bimbo-ish kind of name--at least according to characters with that name on tv shows and movies, almost always blonde with big boobs, and or a psycho girlfriend. ;)