Source:
1, from Ji's surname.
Yuan He's Surname, edited by Lin Bao in the Tang Dynasty, records: "Zhou Pingwang's youngest son is born with a literary talent and counts as a surname." It is because of the word "Wu" on the palm of my youngest son's hand that his name is Wu, a doctor in the Zhou Dynasty. Later, his descendants took Wu as their surname, which was called authentic in history.
2. In terms of country name.
According to Shiben and Wan's Genealogy, Wu Luo was named Wu Luo State and died later. Later, his descendants took the country as their surname and called it Wu.
3. From the surname.
After Wu Ding, King of Shang Dynasty, he took his ancestral name as his surname. According to "Wu Banbei", it was named after Shang King Wu Ding. During the Spring and Autumn Period, after Duke Wu of Song Dynasty, posthumous title was taken as his surname. According to "Customs", during the Spring and Autumn Period, the son of the Duke of Song Dynasty was common, and after his death, posthumous title was called "Wu", which was called Song Wugong in history, and his grandson took his ancestor posthumous title as his surname, also known as Wu Shi.
4. Judging from the name of the city.
According to the book "Customs", a powerful man in the Han Dynasty was given a fief in Wuqiang County, Hebei Province, and his descendants simply surnamed Wu because of his fief.
5. Other sources.
From the compound surnames Wu' an and Wujiang beginning with the word Wu; From other sources; In the Tang Dynasty, Wu was taken as the surname or was taken as the surname: for ethnic minorities, a surname of Wu or a compound surname was changed to that of the Han nationality.