I love Nimue and Vivienne. Ninniane and Niniane are other alternates for the "lady of the lake" and Lenore is her mother.
I wanted to know what you think:
Nimue - nim-oo-ay, we would consider this, but not sure we're brave enough
Vivienne - we're considering this, emphasis on the last syllable
(Ninniane, Niniane - wouldn't consider this, but interesting)
(Lenore - I like it, but not enough to use)