Pei (沛) referred broadly to the Pei region of Yu Province, centred on what later sources call Pei Commandery and Pei State. Families from Pei, such as the Xue clan, are sometimes described simply as “from Pei” without specifying the county.
Xue Ying is one such figure: his ancestral home was in Zhuyi County in Pei Commandery, and he is recorded as being “from Pei”. For the more detailed administrative context of the region and of Qiao County, see Pei Commandery, Qiao (Pei), Pei State, and Peiguo.