Why is it called Wakin

The Wakin, also known as the Wakin, is an old and common species of Japanese goldfish, bred on the basis of the red crucian carp, which was imported to Japan from China in the Ming Dynasty. It is suitable for viewing from the top as well as from the side, and is colored in red and white flowers, red, and white, and has short fins on each fin and a quadrangular tail fin. It has a strong body, strong adaptability, and is easy to keep. It can be mixed with koi in the pond, but it can't grow as big as koi.