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It would've been "he who works on docks" if the surname was Hoogerwerfer, then the '-er' part would suggest that it is a "someone who", as it always is if it ends in "er" (for example, Schoonmaker (someone who cleans) instead of Schoonmaak/Schoonmaken (cleaning) or Bakker (someone who bakes) instead of Bakken (to bake).
But because there's no 'er' in Hoogerwerf, it would just be "a high shipyard/dockyard" instead of "he who works on the docks"...

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I hope i made that clear, if not, ask..