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.