Surname Overview
Surname Status and Readings
Chu (處/处) is recorded as a rare surname in Chinese surname reference works. The cited Zheng Tongzhi and other dictionaries give the reading chǔ, while Zhongguo Xingshi Daquan separately records chù, so the cited references disagree on pronunciation.
Reference: 处姓_处姓的来源和历史_百家姓
Origins
Mongol Sinicized-Surname Branch
According to the page’s account of Qingchao Tongzhi, the Mongol Sarchut clan was also called Sartuk or Sarduk. After the mid-Qing period, some members adopted Chu as a Han-style surname. This is a Mongol surname-conversion branch and should not be presumed to share ancestry with other identically written Chu lineages.
Reference: 处姓_处姓的来源和历史_百家姓
Historical Records
Reported Textual Attestations
Through Xingshi Kaolue, the page quotes Fengsu Tong as saying that the Han-era Beihai governor Chu Xing was possibly a descendant of Chuzi. It also quotes Lushi for a Chu lineage descended from Boyi and for the commandery affiliations of Yingchuan and Peiguo. These are secondary quotations on the supplied page, not direct verification of the original works.
Reference: 处姓_处姓的来源和历史_百家姓
Commanderies and Clan Halls
Commandery Affiliations and Hall Names
The page lists Beihai, Yingchuan, and Peiguo as commandery affiliations of the Chu surname, and gives Yingchuan Hall, Beihai Hall, and Peiguo Hall as hall names established from those affiliations.
Reference: 处姓_处姓的来源和历史_百家姓
Migration and Distribution
Reported Distribution
The page says the Chu surname is found mainly in Jiangnan and specifically mentions Hanshou in Changde, Hunan, Jiangjin in Sichuan, and Xiaoshan in Zhejiang. Because no survey year or population count is supplied, this is only an undated distribution statement.
Reference: 处姓_处姓的来源和历史_百家姓