A little sister for Cora Frances...

[namespy]

Wow, this one is being broached with my partner tonight. I think I've fallen in love.

[hazysummerskies]

Some suggestions I have:

Madeleine Victoria
Rebecca Irene
Juliana Louise
Hazel June
Cassandra Alice
Maria Jane
Lydia Mae

[peppersprout]

What about Mirabel? I think that's a lovely name with the nickname of Mira which is reminiscent of Cora without being too matchy.

[melissaintlouis]

Thais, this is really cool... how exactly is it pronounced? Definitely closer to what I'm looking for though. Something simple but unusual.

I went to high school with a Thais, it was pronounced ty-EES.

Some other suggestions:
Garnet
Mavis
Bertille
Merle
Ines/Inez
Theda
Madge
Marcella/Marceline
Lorna (too rhyme-y with Cora?)
Janet
Leatrice
Musette
Blanche
Lois
Neva/Nevabelle
Rosette
Aster
Astrud/Astrid
Elka
Wylda
Mireille (mee-RAY)
Bardot
Estee
Tulip
Gytta
Lisette
Dinah
Mylene
Eunice
Gretel
Helene
Josette
Felice
Nerys
Paget
Lucine/Lusine
Millicent (since Millie is too insubstantial)