The Arch-preposterous—p152 notes
Gornahoor / Mister
… the word ‘Gornahoor’ is used by the three-brained beings on the planet Saturn in courtesy; they utter it before the name of one whom they are addressing.
… It is the same with your favorites on the planet Earth. They also have added to the name of every person the word ‘Mister’ …
Mister is derived from master, a man having authority over a place or others.