Because among hundreds of surnames, the single surname only includes the first 444, while the "Guan" surname did not enter the top 500, ranking 578th in Taiwan Province Province.

So we can't find a closed surname in the book Hundred Family Names.

Bi is a very old multi-ethnic and multi-source surname group, including Hengxian, Yongning, Guigang, daxin county, mashan county, Jingxi, Tiandeng, Lingshan, Jingxi, tianlin county, Pingnan, mengshan county, Xiangzhou, Xingbin, Jingxi and Ningming counties in Nanning, Guangxi Zhuang Autonomous Region. There are closed clans in Tianjin, Beijing, Shenze City of Hebei Province, Suihua City of Heilongjiang Province, Kaiyang County of Taiwan Province Province, Panxian County and Anlu City of Hubei Province.

Hundreds of Surnames is an article about China's surname. According to documents, it was written in the early years of the Northern Song Dynasty.

There were 4 1 1 surnames, which increased to 568, including 444 single surnames and 24 compound surnames.