As I have been moved to comment before, my work gives me insight into the private worlds of many self-important and semi-delusional people.The following words are henceforth declared off limits for use as last names/surnames, unless you were un/fortunate enough to be born with one of them:
Any variation of your middle name
The name of any mythical creature
Any existing surname significantly more boring than your original one. Don’t be a Smith when you can be a Von Dumbcourt. You’ll be much more memorable this way.
And no one–no one–will take you seriously if your name is Trisha Love Christmas.