Looked into the movie many years ago, given that it is a German production, and, besides actually being Spanish, I was born and raised in Germany. (Wanted to simply link to the thread, but didn't find it.)
The movie's based on an Bryan Edgar Wallace ("Edgar Wallace") novel that carries the same name. Besides the name, and the general "murder house" conventions that belong to the genre, I personally strongly doubt that this is somehow connected to Dave Arneson's creation. In "Dark Shadows", the TV show that Arneson and his early gaming group actually named as a source of inspiration, there's an actual "Blackmoor Prison", after all.
Personally, I think the name is simply a tongue-in-cheek name for the Saint Paul area in Minnesota: Between the Redwood (!) River and the Lake of the Wooda (!), it's mostly wetlands, with Leech Lake and the surrounding reservation as the arguable geological center of the region. A reference to the real-world location would go in tow with other naming conventions from the C&C map - mind you that before that was a "Castle Blackmoor", if only for a short time, there were "The Black Moors". :)
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