One day in the 10^th year of the reign of Duke Zhao of Lu state, Confucius’ son was born. The Duke, who had been admiring Confucius, bestowed a big carp on him for congratulation. When Confucius received the carp, he gratefully thought it was a great honor from the Duke. So, he immediately gave his son the last name Li (it means carp in Chinese), and courtesy name Boyu (yu means fish in Chinese). Then he worshiped the carp as a spiritual encouragement. Later, it became a custom that the Kong family do not eat carps.