Это старое английское слово. Не имя и не кличка. Но канон.
Извините, что без перевода.
The Grey Havens - Else: In The Hobbit, Bilbo called the spiders Attercop, Lazy Lob, Crazy Cob, and Old Tomnoddy. What do the words mean?
"Notes in the The Annotated Hobbit identify Attercop, Lob, and Cob as being taken from similar words in Old and Middle English for "spider" (indeed, the word for "spider" in modern Norwegian is "edderkopp"). The Oxford English Dictionary definition of Tomnoddy is given as "a foolish or stupid person." (The Annotated Hobbit, 170-171)"
World Wide Words: Attercop
"It’s still known — it appeared in the Yorkshire Post on 24 May in an article about Ian McMillan’s work to create a modern dictionary of the Yorkshire dialect. He described it as an old-fashioned word that was still spoken in North Yorkshire, which could also mean a peevish person or a moaner. Mr McMillan provided an illustrative sentence: “Tha’ won’t go in cos’ of an attercop? Tha’s an attercop thissen!”. [tha: you; thissen: yourself.]
The word is Old English, from attor, poison + cop, the head. (Cop, or coppa, was also used by itself to mean a spider, so cobweb ought really to be spelled copweb.) The name was given to spiders in the mistaken belief that they were all poisonous to humans. By the sixteenth century it had begun to be applied to a cross-grained, ill-natured, figuratively venomous person."
http://www.thefreedictionary.com/attercop
"
n Archaic or dialect
1. (Life Sciences & Allied Applications / Animals) a spider
2. an ill-natured person"