I love both Viveca and
Vivian.
Vivienne is usually in my top ten, but for some reason today I'm liking Viveca better.
Vivian is feeling a little stuffy and proper lately, while Viveca is more playful and spunky. I do prefer the Viveca spelling over the other legit spelling,
Viveka, because I think the c makes the name look less harsh than the k.