girl name help, please!

[sunshinefleur.livejournal.com]

my best friend is pregnant with twins, a boy and a girl. she and her fiance have decided that the boy will be named Tristan Wayne (Wayne is a family name on his side). they are having trouble deciding on a girl's name, though. he's vetoed all of her suggestions so far for various reasons -- Kristin because he thinks it's stupid to give kids rhyming names, especially twins (but I would have talked her out of it if he hadnt), Crystal because it's an ex-girlfriend's name, and both Claire and Emma because he has nieces with those names.

so I'm asking for suggestions for a girl's name that would go well with Tristan. please don't suggest anything starting with an 'L', because it would sound absolutely awful with their last name. also, they're thinking her middle name will be Rose, which is her grandmother's middle name, but that isn't set in stone. thanks!