I love Alexandra - there are just so many options! Lexie, Allie, Alex, Alix, Sandy, Sandra etc.
Alison is nice. Where I live, it would be considered the same as naming a new baby Linda, though - so it depends where you live.
I like Aria - I don't know why other people don't. It's a pretty name related to music - and music is beautiful!
I like Blaire too. I think that it looks better without the 'e' but both are pretty.
Brianna isn't my favourite name but it is still lovely and many people like them.
Genevieve is nice - it depends how you pronounce it - Jon-vee-ev (the Jon said in a French accent without pronouncing the 'n') or Jen-a-veev - as to how much I like it, though.
Julianna is pretty. I prefer it pronounced Julie-A-na but I like it either way.
Liv is a lovely nickname - for Livia or Livette - but not on its own.
Liza reminds me of Liza Menelli but otherwise it's nice.
Margo is such a nice name! My dad's first girlfriend was called Margo and I always liked it.
Quinn is nice. It is becoming more common and, with that, tacky. But it is still a nice name.
Renee is lovely! All French names are beautiful and Renee is no exception!
I like all your names, but Alexandra, Aria, Blaire, Genevieve and Renee are my favourites.