Gryffindor, whose name comes from Gryffindor, is the Gryffindor in Greek mythology, also known as the Griffin. Therefore, its symbol is a golden lion.
The word Slytherin comes from the English word "slither". "slither" means "crawling like a snake". Slytherin's choice of snakes is natural.
Ravenclaw Ravenclaw is a compound word of "crow" and "claw". According to legend, crow is a clever bird and can be learned quickly. Although Ravenclaw didn't choose the crow as the emblem, the eagle is also a clever bird.
Hufflepuff is a little different from coming to Hufflepuff. The school badge of their hospital is susliks, which has nothing to do with Hufflepuff in words or other aspects.