Perhaps "Idle Curiosity" would be a better prefix, but BS is accurate enough.

I first noticed the name Blennerhasset as that of the bass player, James Blennerhasset, who has played with, among others, Mary Black. For no good reason I assumed the name to be Scandinavian or Dutch. Around the same time I was reading Gore Vidal's novel "Burr" in which an Irishman named Harmon Blennerhasset makes an appearance. Later I came across another Blennerhasset in a book about Parnell. This one was an MP and one of Parnell's party. It dawned on me that the name is Irish and a friend has told me that the name is not uncommon in Sligo.

A quick look at Google gave me more information about Harmon Blennerhasset. Among other things he had been a member of the United Irishmen. And I learned that there is a small town in Cumbria called Blennerhasset.

Does anybody know any more about this name?

As I say, this is merely the idlest of idle curiosity, the kind of thing that before days of Mudcat (BM, you might say) I would have pushed well into the recesses of my mind