Anything I've put out is usually under my online cognomen that I've had for years. If someone comes across that name attached to a story, guaranteed that it's my hack. My online name is quite distinctive.
I've considered a nom de plume since I was twelve, just to be exotic. Although now I'm thinking that it might be a good idea to write under a pen name - that way, I can market the "brand" of whatever name I choose and still retain my privacy with my real name. (Plus side, it would mean getting a whole new wardrobe for the image!)