The Chinese characters "wang ba" (king eight) are said to mean turtle because lines on the back of a turtle shell resemble the character "wang," which is the eighth of the 100 Chinese surnames.
王八，據說是「忘」了四維八德，罵人無恥；也有人認為是因為百家姓裡王排第八，鱉的背甲上則有類似王字的圖案。