What should I name my German Shepard?

She a girl. She's 3 months old. I got her from an older lady who couldn't keep her at her apt. Her name is Heidi but I really don't like it and if I'm the one yelling it...I think she is still young enough to change it....Anyway any suggestions...kinda would like something German but not anything prissy sounding(my problem with Heidi...I just keep picturing that movie). IMHO If she's gonna be a big tough dog she needs a big tough name younno? Anyway any suggestions