Aikouka means "The Lover" or "The Fanatic" in Japanese. I chose it because having a name in Japanese is like cool++ and I originally "renamed" myself back in an ol' IRC chatroom on sorcery.net when I saw someone had Japanisized himself and frankly... I had to as well! So, being the e-pimp that I am, I decided I needed a name with some.. pnaz.. and I chose to get the translation for "The Lover" (I think from Jim Breen's e-dict). So here I am.
Ummm about 5 or more years?
Pretty much. Although there are bastards who keep taking my name, so sometimes I'll use "ShinAikouka" or a variant on that (such as Shin_Aikouka), which you can translate that to "Real Aikouka".