I do a similar thing with my World of Warcraft character names! Except i use variations of Korange instead, It started as Orange but got eventually changed with a K at the beggining lol. I use Korange, Korangie, Korangii, Korangor and things like that.

I've heard the thing about Finnish people using a lot of nicknames, is there a reason for it? like a lot of people having the same name? People do the nickname thing in my country too but mostly when there are multiple people with the same name in a classroom or workspace.