My irl name is Christian. In elementary there were a bunch of other kids named Christian, so it was kinda hard to keep track of who the teacher was calling on and such. My teacher gave me the nickname 'CM' to distinguish my name from everyone else. It stuck - the rest of my teachers and friends started to call me CM in and out of school, and even my family started to tease me about it. I downloaded Graal way later on, and my nickname had stuck with me. I chose to use CM as my name because pretty much everyone irl had recognized me by that name.