The medical conditions in ancient times were not good, and the child mortality rate was also high. In order to pray for the healthy growth of children, they usually have an unpleasant name. For example, when Emperor Wu of the Han Dynasty was a child, his nickname was Queer (Queer means pig in ancient Chinese). The ancients called sons sons sons, which is said to be influenced by Sima Xiangru. Sima Xiangru's father called him a dog. When he grew up, Sima Xiangru was brilliant and had a bright future. Later, people rushed to follow suit, so they humbly called their son son.
In the Southern Dynasties, Stuart Xie Wei was young and smart, and he could write good articles at the age of 10. Once the prime minister of the dynasty praised him for his skill, and Xie Zhuang held his son on the back and said, "It's really my daughter." When Xie Yong grew up, he was really worthy of the title of child prodigy, and he was very capable. Thousands of years later, daughters are used to praise capable and talented men. It was not until the Yuan Dynasty that the official woman was called a daughter in the script book, and this title gradually became a rhetorical woman.
In ancient times, the dog was actually a representative of loyalty, which is a useful term, such as "like a tiger, like a son". China people have carved modesty into their bones since ancient times. And I think there is another possibility to call it a woman's daughter, because when the ancients married their daughters, the more valuable a woman was, the more things she married, which is in line with the original intention of the word daughter.