I'm really torn on the name. I knew an Ivy in school, but it still isn't namey to me. My SO adores it, and I like it enough to use. However, poison ivy still comes to mind, along with the fact that it's gaining in popularity. There are currently two Ivies (or would the plural here be Ivys?) in my niece's preschool.
WDYT? She would probably be Ivy Cecilia, as Ivy Perpetua is too out there to use, plus as Roxstar pointed out it's perpetual ivy...not a good thing. :-D
Her sisters' names would be taken from the following: Tabitha (despite how hated it is), Veronica, Miriam, Judith, Magda/Magdalen, Eve. Her brothers' would probably be Julian, ~Xavier, Raphael - which I don't like.
*sighs* I wish my boyfriend was one of those guys who didn't care a whit about names.