The names of female ratties I have had in the past were named:

Sara
Abbie
Paris
Arwyn
Arlyss
Gwen
Emma
Mika
Aiyla
Ayah
Andie
Kaysen
Torch
Rudy
Darcy
Toryn
Akai
Athena
Harlie
Lyric

I think thats it, but probably not... Lol... Please note, I didn't have all of them at one time.