@schmidt_fu, it was, originally, my Twitter handle which I've been using for a few years one. I had used my real name as my Twitter handle before but eventually learnt that making your true identity obvious for anyone isn't always a good idea.
@sickshow ah, I see! In my case, I'm too easily misidentified (Schmidt being a very common name), so I came up with this one because it was available, and short enough, for Twitter :-)