Made a support ticket because I didn't get my Jarvan skin ... after 8 days they give it to me, while doing so they changed my name from CaptainDouchebag to Captain Bag >.<
Didn't give me any option for a new name, I have to deal with it or pay 10$ =(
Yea, if they don't like your name they change it to whatever they want.
I know of someone who had something racist and they changed it to "PinkCupcake" or something like that.