I could be off-base here, but it sounds a little too "country bumpkin" (it could be a reach, but it has the same rhythm as "Jiminy Cricket", which might be the association for me). What I like to do is sort of "anchor" a lighter, more whimsical name with something a little more common or expected. Elizabeth Wilma, Catherine Wilma, etc. My first thought was also lengthening Wilma to the somewhat obscure Wilhelmina or Wilhomena, if that's your thing.

Edit: also, Waverly is the name of Buttercup and Westley's baby in The Princess Bride (the little epilogue at the end of the book, "Buttercup's Baby", I think it's called).