WW-Why are banks called “piggy” banks?

Where did the “piggy” bank get its name? It comes from an old English term for the type of  clay used to make common objects. This clay is called “pygg.”  In the Middle Ages, before banks were invented, people would store their money in jars called “pygg jars” or “pygg banks.”

Over the years the word “pygg” became “pig.” One day a person thought it would be funny to make a bank that looked like a pig. Even as time went on and different types of clay was used to make the banks, people continued to make the banks in the shape of pigs just because it was popular.