Dragon because the bishop snaps its jaws down along the diagonal so often?
or because calling anything Dragon makes it popular? (The Veronicas have a song called Popular you can listen to on Youtube to learn more about this.)
looking at the sicilian pawns, it does kinda resemble those street party dragons with lots of Asians underneath, making the beast come alive while potentially having to endure each other's gas in a dutch oven environment.
ha.... that was great i never knew this.