E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The former is Norman-French, the latter Saxon.
Pork, I think, is good Norman-French; and so, when the brute lives, and is in charge of a Saxon slave, she goes by her Saxon name; but becomes a Norman, and is called pork, when she is carried to the castle-hall.Sir Walter Scott: Ivanhoe.