Origins
Ancient Origins and Naming Systems
The source lists several origins: descendants of Bichen, a Spring and Autumn official of Zheng, adopting the ancestor’s name as a surname; descendants of the ancient state of Beier adopting the state name; and members of the Xianbei people adopting “卑” as a surname. The Beier-origin account is explicitly presented as “traditionally said” and is not established as historical fact.
