Well, I'm not sure how to explain it, but I'll try:
Some of you might remember a cartoon hero called He-Man. It was a serie in the 80's and there were also action figures and stuff like that. Well, there was a bad guy called Hordak, and he had captured two guys and turned them into half-robots. The other one then got the name Extendar, because he had the ability to extend his neck, legs and arms. Of course he managed to escape and then joined the Good Forces and fight among He-Man, Teela, Man-at-Arms, etc. etc.
So, that's where I got my nick from.. Some years ago I used Agathon as my nick, but I changed it because eveyone kept asking me "Are you the singer of Gloomy Grim?" But the funny thing is, when I took Agathon as my nick, I hadn't even heard about a band called Gloomy Grim. At the time I took it from my history book, where some ancient guy was called Agathon something. But well, now I'm Extendar and happy about it.