I got lucky when registering an LLC last year for some contract work because despite having a relatively common first and last name, no one had named an nLLC that in my (very large) city. At some point during the process, I had to pick an officer title for myself for some paperwork, but there didn't seem to be any guidelines or restrictions on them, so I just put down my name for that too; I figured that being Firstname Lastname of Firstname Lastname LLC is probably even more clear than "CEO" since it makes it even more obvious that I'm the only one in it.

Doctors and dentist sometimes do that for their practices, but aren't the only ones working there.