Where did the name 'Trey Songz' come from?

This image appears in the gallery:
Trey Songz facts: 16 things you didn't know but really should

1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 

10. 16 images

See the full gallery: Trey Songz facts: 16 things you didn't know but really should