Whoever thought it would be a good idea to start asking for real names of people: Go. Fuck. Yourself.
Not using real names is BASIC SAFETY on the internet. The last thing anyone here needs is to be stalked by someone who likes their pictures, or worse, hates them. Criminals already have used social media to figure out when victims are out of town to rob their homes, or to determine when they'll be alone to harm them. DO NOT TURN DEVIANTART INTO ANOTHER FACEBOOK. Do NOT make it a place where people unwittingly become victims because you can sell our private information for a little bit more with a real name. This is particularly important on an art site in the wake of murders like those of Charlie Hebdo's artists who were killed simply for offending someone who knew where to find them.
It also protects from more mundane concerns. Not getting fired or looked over for jobs because employers happen to be prudish about your art you post privately, or for the political opinions you espouse through your art and journals. Not getting persecuted by family, classmates, coworkers and others in your life for the things you NEED to express - particularly those whose gender, sexuality, or other aspects of their life are discriminated against.
Being optional is not an excuse, by the way. People came to you in trust that they could be "deviants" here, expressing beliefs, personality, and their true selves that the world would not accept, and you are creating a peer pressure system that will strip away their ability to find what should have been a safe haven here.
So, again, fuck you. Take your "real name" bullshit and shove it.