Yggdrazzil is a name I read in a comic called Storm when i was ..10..my mum gave me that comic when I was sick
When I got in touch with my first internet application (being the chatprogram that came along with command & conquer, called westwood chat) I picked that username, and I have used it ever since
It's also the name of practically any character I make in a game, if the name length is supported.