Porstman
Porstman is a surname of German origin. It is believed to derive from the given name Porst, which is a variant of the German name Burkhard. The name Burkhard itself is composed of two Germanic elements: "burg," meaning "fortress" or "castle," and "hard," meaning "brave" or "hardy." Therefore, Porstman can be interpreted to mean "son of the brave fortress dweller" or a similar variation.
Like many surnames, Porstman likely originated as a patronymic, indicating descent from an ancestor named Porst.