We have made a decision, at last (just as well, as my brain was beginning to fry)
We are going to register DD2 as Evelyn Charlotte, and call her Eve.
DP and I discussed playing around with surname combinations to make sure Eve goes sounds right with our surnames.
I know Eve is also popular, but because it's a name I really love I don't care!
I feel so much happier now we've made the decision. It feels a little weird calling her Eve but I'm hoping it doesn't take long before we get used to it!
Thanks to everyone who posted!
jivegirl