Well, I, for one am glad you started this thread, D.E.S.K.Top668, because I was honestly just wondering where you got your username when I saw it in another thread.
As for me, mine is fairly boring.
Real name: Lynn
Nickname: Linny
Linny in that “Japanese” translator that used to be on stupid.com: Rinni
I prefer the look of lowercase r to capital R, so… rinni
Also, this came about so long ago that rinni has evolved into a real life nickname as well. When I think about myself, I mentally call myself rinni. I feel like that’s who I am.