I had also thought it's Mt Gox because it rhymes with Fort Knox, and Mt because the currency is won by mining.
I hope Mt Gox is as secure as Fort Knox..
It better be. When you think about, a well known structure, guarded by humans born with flaws, that can be easily destroyed, assaulted or besieged with the right amount of angry people who want gold when the dollar falls and other governments with unlimited funding and destructive weapons.
Invest in bitcoin, the ideaology and the currency.