You can safely assume that many scientists are borderline AutisticHow safe is that assumption? I've never met a scientist who I would call remotely autisitic. Progress in science depends on absorbing ideas from others, communicating your own findings, engaging in discussion and review, and lots of teamwork. Don't confuse the ability to focus and analyse, and the possession of a healthy contempt for consensus and imprecision, with autism.
Apropos the question in hand, unless your name is John Smith, I can see no reason to adopt a pseudonym. The handle your parents gave you should be enough to identify most people in a small forum.