Wastelander, Mercenary, Slave, Brahmin, Rat, Dog are names of NPC followers. Would be nice if they were not available to players. The name just shouldn't be exactly the same.
Or they could be changed to something similar, but with not allowed characters like: #Wastelander, #Mercenary, #Slave, #Brahmin, #Rat, #Dog. That way one would know if it is NPC or PC following him.
On the side note: Good Job Wastelander/Brahmins