Vivian is a masculine spelling for me. I do like
Vivien for a female, though.
V.
Lavender: not my style at all. At. All. I dislike the name
Lavender so much, I can't honestly give you a judgment about whether there is too much V in the name.
V.
Amethyst: combo flows well. Nice.
V.
Crescentia: Does this combo mean "alive and growing"? Hehee. I'm sort of neutral about it.
Vivien Demetria?