I don't think there is a way. It's a shame because some things I don't like having someone else's name on. Luckily for me I am 50 all crafts so I can make most of my stuff. I wish there was an option like in ffxi where you had to buy a special crystal in order to put your sig on an item. Usually it was just reserved for crafting stuff for your friends, which is how I feel it should be handled in this game too.