First Name, Last Initial. First forum I ever joined was the XR forum about 12-13 years ago and about 10 motorcycles ago. I had an XR400. Have kept same name on about 50+ forums since. Easy to remember.
I was reading Icelandic Sagas a long time ago and ran into the character Skalla-Grimr which loosely translates to grumpy bald man. Seemed appropriate and I have run with it ever since. There is some semi-famous guy who uses the same handle to do reviews of bladed weapons and every once in a while I run into someone who is disappointed that I am not him. As far as I know I was using it first ::013::