I like
Evan on a boy (I remember having a crush on a boy named
Evan in elementary school :P)
I like Evana on a girl. I'd like
Evan as a tomboyish-type nickname for Evana or Evanna, but not as a full name. "
Evan" sounds unisex, but it looks masculine, and spelling it Evyn or Evin or whatever would look too awkward IMO.
I like the sound of Evvy (not the look though. Evi or Evy would look better, although they might looks like they're supposed to be pronounced EE-vee.)
Evanne? That looks like a combination of
Eve and
Anne... like eev-ANN or something. I have seen a girl
Ryanne though (pronounced like
Ryan), so maybe. *shrug*