The title introduces several sources of surnames. According to the materials, some surnames come from feudal countries, some from the names of emperors and senior officials after their death, and some from their occupations. As long as candidates know the materials, they can make correct inferences even if they don't know the origin of surnames before. In ancient China society, surnames mainly came from the following aspects: ① Taking the country name as the surname. ② Take fief as the surname. ③ Take the official name as the surname. ④ Take occupation (skill) as the surname. ⑤ Take the place of birth and residence as the surname. ⑥ It is called "surname" because it is related to the King of Zhou or the princes. ⑦ Take Zuyan as the surname. According to the patriarchal clan system, the male clan only includes three generations of close relatives of monarchs, and the son of Gongsun is not a male clan, so a new surname must be established. Most of these aristocratic children take their grandfathers' words as their surnames. In the pre-Qin period, the king had the highest position, with five titles, namely Zi Nan Gong.