Can monks (or any class that can equip two weapons) dual wield two unique fist (1-handed) weapons that has the same name?
You can not dual-wield the same weapon. You can see in this thread:
To anyone and everyone that hasn't played a monk and found a legendary fist weapon. I have personally found 2 of the same weapon with different stats and the game would not let me equip them both. So there for making this weapon a piece of crap considering the fact that you can not duel wield 2 of the same legendary weapons.