My name is Mr Smith is a pseudonym (obviously).
My name is Mr Smith originally tried to register a variety of other usernames, including "Mr. Smith" and similar variations, only to be told that each was either taken, or too similar to an existing username. Funnily enough, many of these users actually have no contributions.
My name is Mr Smith has privilege, though sometimes forgets it. If My name is Mr Smith does seem to forget this, please (gently) inform them of the fact.