I have to say that both Annabel and Fleur aren't personal favorites, but they do sound very, very nice together. These may not be your style, but what about (I apologize in advance for any repeats):
Annabel Ruth
Annabel Faith
Annabel June
Annabel Viola
Annabel Maeve
Annabel Felicity
Annabel Claire
Annabel Grace
Annabel Violet
Annabel Sofia
Annabel Iris
Annabel Hope
Annabel Irene
Annabel Margaret
Annabel Camilia
Annabel Hazel
Annabel Louise
Annabel Lavender
Annabel Kate
Annabel Joy
Annabel Jane
Annabel Therese
Annabel Clara
Annabel Heidi
Annabel Rose
Annabel Coral
Annabel Lydia