I enjoy creating unusual characters and character names -- I used to do this more, when I sometimes GM'ed at a .hack// roleplaying forum. Dorikka is just a name that I came up with for a boss creature. I liked the name, so I continued to use it. shrug

The only name use that originates from somewhere else is Miroki, which is a modification of Mitsuko Souma's name from Battle Royale, a book that I really liked. I don't think I've ever used Miroki as a psuedonym before, though, only a character.