Английский Этимологический словарь - pork (n.)

- 1215, from L. porcus "pig, tame swine," from PIE *porko-. Used in Eng. for "flesh of pig as food." Pork barrel "state's financial resources" is 1909, on notion of food supply kept in a barrel; the shortened form pork in this sense is attested from 1862. Pork-pie hat originally described a woman's style popular in the 1860s.