Amaterasu is a goddess of the Sun in the Japanese Shinto religion.
Amaterasu was a Goa'uld system lord in the television series Stargate SG-1. She was a minor character and only appeared in the episode New Order, parts 1 and 2, and was mentioned in two other episodes.
Amaterasu also appears in a self named manga series and others, including The Five Star Stories, and 666 Satan.
Amaterasu is quite an unwieldly name, but it is very unique and beautiful. I could see Amy or Sue as nicknames, but they are so pedestrian compared to Amaterasu, that they almost detract from it. Perhaps she's best left to the middle spot.