Coming back to this, so many years later:
Basically, I still can't confirm or deny this, as the naming structure of Blackmoor seems to have been fairly random/coming from such a variety of sources that it's impossible to track down from today's point of view, and without access to the original sources and libraries.
Now, the Norman invasion of Wales has always been a fairly popular topic among wargamers, so the connection seems reasonable - BUT at the same time, all we know from the origins of the first Fantasy Game (Islandic Cave campaign, etc.) doesn't seem to explicitely suggest this.
Like, for all we know, this could as well be a reference to Napoleonic wargaming:
http://en.wikipedia.org/wiki/HMS_Owen_G ... %281808%29My personal, if romanticized origin of Blackmoor names shall remain the Whiskey rule. :wink: