There are three theories about the origin of Zhai and surname. One is from taking the country name as the surname; The second is from Ji's surname, taking the city name as the surname; The third is from the surname Ji, and the ancestral word is surname. Famous historical figures include Kuaiguangdian, Kuai Tong and Kuai Xiang.
According to "Custom Tong", Kuaide is a descendant of the doctor of Jin State in the Spring and Autumn Period. During the Spring and Autumn Period, Miao became the fief of the doctor of the State of Jin, and his son and grandson took Miao as their surname, which has a history of more than two thousand years. The nobles lived in Xiangyang County, which is now Xiangyang City, Hubei Province. Therefore, Miao's descendants take Miao as their surname and call Miao their ancestor.
Origin one
Originated from the surname Zi, from the Shang Dynasty, it belongs to the country name. According to the historical book Dialectics of Ancient and Modern Surnames, there was an ancient country in Shang Dynasty, so it was located in Luoyang City, Henan Province today. The establishment of Kuaiguo was in the Tai Jia period of Emperor Taizong of Shang Dynasty (BC 1579-BC 1577), which was actually given by Prime Minister Yi Yin when he was a regent. After four centuries, it was destroyed in the process of Ji Changdong's expedition to Zhou Wenwang in the last years of Yin Shang Dynasty.
After the national subjugation, the descendants of Kuai royal family and some nationals took the name of the old country as their surname, which was passed down from generation to generation and was one of the very old surnames.