This is quite interesting (grabbed from http://www.ancestry.co.uk/name-origin?surname=Pinner):
- Pinner Name Meaning
- English and North German: occupational name for a maker of pins or pegs (or alternatively, in the case of the German name, a metonymic occupational name for a shoemaker), a derivative of Pinn, with the addition of the agent suffix -er.English: occupational name for a maker or user of combs, Anglo-Norman French peigner, an agent derivative of peigne ‘comb’.English: habitational name from Pinner, now part of northwest London, which derives its name from Old English pinn ‘pin’, ‘peg’ + ora ‘slope’, ‘ridge’, describing a projecting hill spur.Jewish (Ashkenazic): habitational name for someone from Pinne (Polish Pniewy) near Poznan.German: habitational name for someone from a place called Pinnan or Pinne.
Source: Dictionary of American Family Names ©2013, Oxford University Press