Nona, Decima, and Morta were the Parcae (the Fates) in Roman mythology, the equivalent of the Greek Morai. Morta's probably not usable (though I like it), but what do you think of Nona and Decima?
Some combos, for fun:
Nona Geraldine
Nona Hazel
Nona Marguerite
Nona Beatrice/Beatrix
Nona Phoebe
Nona Marcelle
Nona Roxane
Nona Virginia
Nona Emily
Nona Cecile
Nona Clarice
Nona Lorraine
Nona Julie
Nona Irene
Nona Rebecca
Decima Eve
Decima Edith
Decima Enid
Decima Rose
Decima Violet
Decima Clare
Decima Ruby
Decima Iris
Decima Janet
Decima Zoe
Decima Chloe
Decima Cleo/Clio
Decima Fern