Congrats! I am sooooooo happy for you! I don't know much about rats since I have been a mouse fancier for a while now.
However, I am an expert at names! hehe, so here are a few I thought out for you:
Brandie (American, means Sweet Nectar)
Mora (Spanish, means Sweet Berry)
Rianna (Welsh, means Sweet Basil)
..I stuck with the sweet thing here cuz you call her Sweetie a lot, hehe..
Jeneva (means White Wave)
Vianca (means fair)
Chantrea (Cambodian, means Moon)
Chloe (Greek, means blooming)
LOL! I think that would be enough for her and a buddy!