There are three possibilities: 1, which comes from the won surname, after Boyi. There was a descendant of Boyi named Fei Lian, whose surname was Ping's in Pingyi (now wenxi county East) until the sixth grandson was named Ping's Mausoleum. When Zhou Xian was in office, he was named (southwest of Linyi, Shanxi), so he removed the word "Yi" and added the word "Yi" to indicate that he left Pingyi, which was called Pei's. 2. It originated from the State of Qin in Zhou Dynasty. Qin's front body was sealed in Qin by Zhou, which was called in history. Some descendants of Qin Feizi were named Marquis and leaders of Peixiang (now Peicheng, wenxi county, Shanxi). The nobleman's name is Pei Jun. His descendants gave the city a surname called Pei. 3. It originated from the Jin State in the Spring and Autumn Period. Jin Pinggong appointed a noble man to Peixian County (now Qixian County, Shaanxi Province) as the leader. His name was Pei Jun. His descendants took "Pei" as their surname and called it Pei.