Negan’s lack of a last name wasn’t the only thing about the character Robert Kirkman made definitive, as he also confirmed “Negan” is definitely the villain’s first name.
But not before Andrew Lincoln and others could craft jokes and theories about Negan being the last name of the Saviors leader, and that the villain’s actual first name was something far more embarrassing.
That’s a shame, as it would be great if the reason Negan carried Lucille was to bash the skulls of anyone who knew his real first name was “Pendleton” or “Effervescence” or something like that.