John in Latin will sound something like "Johannus", IMO. SteissD is not translatable into any language, since this is an abbreviation including 6 letters of my family name and the first letters of my private name. My private appears in the Bible, and it is the same in all the known languages. Surname has no translation either. Maybe, it refers to some particular place in Germany (my late father was an ethnic German), but I failed to find any references to existence of such a place by means of Google search.
Oh, sorry, I am wrong. I have found it.
It is in Baden-Württemberg, district Ortenaukreis, and here is the emblem of this place: