2. From the surname. From the fief of the Yellow Emperor branch, it belongs to the name of fief. Cai is a branch of Wa nationality, and holds a high sacrificial position in the tribe. Cai and Ji were commonly used in ancient times, so Cai came from Ji.
3. from ethnic minorities. After the Song Dynasty, the Jurchen Wulin in the State of Jin was changed to the Han surname Cai, and the Eight Banners in the Qing Dynasty were changed to the Han surname Cai, such as, Wuling Ashi, Samara and so on. After living together with the Han nationality for a long time, these foreigners gradually assimilated into the Cai surname of the Han nationality in the north and flourished in the northeast.
Extended data
Celebrity surnamed Cai:
1, Cai Lun, a native of Guiyang County in the Eastern Han Dynasty. In the last years of Han Yongping, he entered the palace as a minister. In the second year of Zhanghe (AD 88), Cai Lun was promoted to be a regular servant because of his meritorious service to the Empress Dowager, and Cai Lun also held an official position. Cai Lun summed up people's paper-making experience in the past, innovated the paper-making technology, and finally made "Cai Hou Paper".
2. Cai Yan, whose real name is Wen Xi, whose real name is Evonne, was born in Pixian County, Chenliu County (now Qixian County, Henan Province), and was the daughter of Cai Yong, a female writer in the Eastern Han Dynasty. Extensive knowledge, good at literature, music and calligraphy.
3. Cai E (1882 65438+February18-1916 65438+10/8), formerly known as Genyin, Han nationality, born in Songpo, Shaoyang, Hunan Province, was a great patriot and a modern man.
Baidu Encyclopedia-Cai surname
Baidu Encyclopedia-Cai Lun
Baidu Encyclopedia-Cai Wenji
Baidu Encyclopedia-Cai E