I like
Eve. I like
Eva better, but there is a nice simplicity to the name
Eve.
I know a few Evas, but I don't think I've ever met an
Eve. I don't think their parents would need to be religious though.
Some are probably
Eve for short, but I think
Evie is a more common nickname. It feels more nickname-ish.
I think as
Eva gets popular,
Eve will as well, but never to same extent as the longer forms.