Why is the animal called a pig, and its meat called pork?

This is because world like pig, cow, sheep and calf come from the Anglo-Saxon or Old English language. After the Norman conquest in 1066 the wealthy French-speaking landowners called these animals by their French names when they ate them, giving us the words pork, beef, mutton and veal. The Anglo-Saxons, however, carried on calling the animals by their original names, so we have both sets of words.