I love
Vivien as in
Vivien Leigh (real name
Vivian Mary Hartley), though
Vivian is usually the
Brit boys' spelling, and prefer
Vivien to
Vivienne (though also like that very much).
I especially like
Vivien with other six-letter names because I think it looks lovely and balanced:
Vivien AdriaVivien EstherVivien FreyaVivien JulietVivien Levana
Vivien RoseVivien Sophie