Mine is easy. I had to come up with a posting name at another site for an NBA forum I was in back in '98, and I had to come up with it rather quickly as I was invited to participate the day before the season started. I didn't want to post my real name. I therefore came up with SixFive = Six feet Five inches tall = my height. I didn't want to post as a number (65), so I spelled it out. What can I say, I have no creativity skills, lol! Good thread, I've often wondered the same thing about various nicknames. I'm going to start a similar thread about signatures if one hasn't been done in a while.
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It's far better to be LUCKY than good.