Evarista is very epic and bold and fantastical and supreme. I like it quite a lot. For some reason it reminds me of stars in the night sky?
Electra is great, but I prefer Elektra. I prefer the pointy K. I'm not at all the type of namer to fill in every C with a K just for the sake of being "unique." But if there are multiple spellings of a name, I'm likely to pick the pointiest spelling. So yes, I prefer Elektra. Oh well, that's insignificant. Your combos sound very nice, but
Charlotte,
Clara and
Irene are just nms. Here are some hopefully interesting combos I've constructed.
Electra AmelieElectra AnoukElectra CeridwenElectra Demelza (I kind of like the almost-rhyme.)
Electra ElzbietaElectra GwenevereElectra JaneElectra JeanElectra Josephine (Ooh this one's awesome)
Electra Lysistrata (now I'm just getting silly. Though it is cool!)
Electra MadelineElectra Nyx (hehe say it fast... Electronics. =P)
Electra Vivian