The fact that it's a made up name isn't the reason it's tied to the fifties and sixties-- the reason it's tied to the fifties and sixties is because that's when a ton of people used it. Now it's a mom/grandmother name. I can see it coming back when the trends for it are right.
I'm not sure who said it's not legit? Usually posts like this are supposed to be in response to the comments but this doesn't appear to be.
Persephone Evander Hero
Fae Nocturne Silver
www.behindthename.com/pnl/59411