Welllll, i was originally going to go with Cerebaton, which is my name in pretty much everything else and is from the Philip Pullman Dark Materials series. (It's also my Xbox live gamertag if anyone wants to add me, but i don't have the internet at home at the moment, and have to wait till im in college or at my dads =/)
Otogakage began as an idea, as in, Hokage, Kazekage etc, and i wondered what the leader of the sound village would be called. Otogakage = Sound Shadow =]
For some reason I wanted something related to Norse mythology, but Thor, Loki and similar were predictable and I really didn't like Odin or even Óðinn, so I went for the German version, which is, by the way, the one Gaiman (American Gods, etc.) uses most, so I knew it and liked and took it. The British version (Woden) resembled too much wooden, so no thank you. It was really between Wotan and Óðinn. As you can see I chose the first.
I watched Code Geass, thought of 1337, and thus, Code 1337.