It was a spelling error made when I first made my youtube account. When I noticed it, I thought it was kinda neat and just stuck with it. It is now my user name on any website I have a user name. You know when you spell something wrong, and even if you can't figure out what's wrong, you can still tell? This was at a time when that spelling of the word "hi" just didn't seem wrong to me.
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Yes, it is odd that I never changed it.