What is the reason why Baiyangdian got its name?

The record of Baiyangdian was first seen in Zuo Si's Sandu Fu, and one of the words "digging carp lake" refers to Baiyangdian. In the Song Dynasty, Baiyangdian was named Aries because of its huge water potential, and the waves rolled like running sheep. In the Ming Dynasty, the water potential of Baiyangdian Lake was greater, so it was changed to "foreign" in Wang Yang. And a kind of precipitation is called precipitation.