Although that's an interesting theory you have about the importance of names. Reminds me of the conversation I had with Scott about X-Men and the reason people use code names in uniform.

Yeah, it is a bit the same. With magic users, telling another mage your real name is a sign of ultimate trust - it's a bit like handing them a loaded gun and trusting them not to shoot you with it. With the code names, you're protecting those closest to you - your friends, your families - since the wrong someone getting hold of your real identity could be just as dangerous.