You don't have to respond to all of these, just general feelings. Also, I'm American, so I've noticed some of these names have a more "dated" connotation in the UK than in the US.
Girls:
Felicity "Flick"
Tessa "Tess"
Juliet "Jules"
Violet
Scarlett
Elizabeth "Eliza"
Sylvia "Sylvie"
Margot
Madeline (pronounced "MAD-uh-LINE") -- how inevitable is the nn Maddie?
Caroline
Susannah
Charlotte
May/Mae
Lily
Dahlia ("DOLL-lee=yah")
Boys:
Miles
Christopher "Kit"
Fraser
Graham (I pronounce it "GRAM"):
Dean
August
James "Jamie"
William
Rowan
Robin (maybe too girly in the US?)
Jasper
Jack
Griffin