I love
Vivian for a boy! It's one of my top names, and I see it as being very masculine. I'm not wild about
Vivienne for a girl- for the same reason I like
Francis (boy) but not
Frances (girl)- simply because
Vivienne and
Vivian sound almost identical, and the latter is masculine to me. However, I have nothing against it as it's a legitemate feminine form. My choice for a girl would be
Viviana, though; it's much more feminine, and I can't help but wish that more people would use it for their daughters and leave
Vivian to the boys. :-(