Your name should be catchy as well as unforgettable. Most super villains go for names starting with "doctor", or "general". You need to show that you have a certain level of professional status. If you are merely "Mr. Johnson", nobody will take you seriously. However, when you change the above name to "Lord Marshall Johnson of the doom legion", it instantly sounds more appealing. Think carefully about your name, as it also needs to fit in with your evil characteristics, such as incessant laughter etc…