Evarista sounds familiar, but I can't quite place it -- not necessarily as a name for a person either.
Linda Evangelista? Starbuck's barista? I'm not sure. Do you have any more information on it, or was it a product of your dream-mind?
Electra is very intriguing. It has the potential to be really kooky, but artsy and daring too. I'd stay away from a fn beginning with a "k" sound.
Carmen Electra immediately comes to mind when I consider
Clara Electra.
Carmen Electra isn't necessarily a bad association. It's just that she owns that template in my head and I'd prefer to see you strike out in a new direction.
Charlotte Electra is nice.
Zoe Electra,
Noor Electra,
Lucienne Electra? [I almost suggested
Juno Electra, but "General Electric" came to mind. It's probably best to avoid a "j" first name too.]
My opinions are always boring. I work hard to make them so. :-)