Where did this name come from? I haven’t the slightest idea. It could refer to Nordwalde in northwestern Germany near the border with the Netherlands, however, if the chess tournament in which the opening moves first appeared was held in that area, this fact was successfully disguised. In any case, the variant is among the less recommended for black, who has better chances in other continuations.
A variation of this variation, called the Bücker Gambit, occurs after sacrificing the queen-side knight, and it is actually the fundamental idea of the trap. Take a look at this game: