"Porlock" was also the name used by Sherlock Holmes' mole in Moriarty's camp in the first chapter of The Valley of Fear. He sent a coded message to Holmes that dark deeds loomed at Birlstone Manor and then, frightened by his betrayal, he changed his mind and didn't send the key, but of course S.H. deciphered it anyway...

I'm not seeing the allegorical connection regarding the name. Any assistance?

(Sherlock Holmes "took" opium - do you suppose Arthur Conan Doyle did?)