Surname Overview
Surname Status and Pronunciations
The source identifies “共” as a currently uncommon surname and explicitly classifies it as a Han Chinese surname, recording the pronunciations gōng and gòng. It says the gōng entry is recorded in the Zheng Tongzhi: Shizu Lue, while the gòng entry is recorded in Zhongguo Gujin Xingshi Cidian and Zhongguo Xingshi Daquan.
Reference: 共姓_共姓的来源和历史_百家姓
Origins
Traditions of Surname Change
Citing the Tongzhi: Shizu Lue, Xingshi Xunyuan: Xingsuan, and Yuanhe Xingsuan, the source says that some descendants of Gong changed their surname to Hong or Gongg. This is presented as a reported tradition and documentary record; it does not justify treating all people surnamed Hong or Gongg as part of a Gong lineage.
Reference: 共姓_共姓的来源和历史_百家姓
Commanderies and Clan Halls
Commanderies and Hall Names
The source lists Dunhuang, Jiangling, Yuzhang, Xuancheng, and Wuling as commandery associations; another compilation section additionally lists Henei. Hall names include Bohai, Wuling, Liugui, Jiangling, Xuancheng, Yuzhang, and Linjiang. The source does not provide a clan genealogy establishing relationships among these names, so no such lineage is inferred.
Reference: 共姓_共姓的来源和历史_百家姓
Migration and Distribution
Recorded Distribution
The source says that the surname pronounced gōng is currently found in Shuozhou, Xinzhou, and Yuncheng in Shanxi and in the Yanbei area. Another section lists Xintai in Shandong, Huainan in Anhui, Jiangxian in Shanxi, Taipei in Taiwan, and Hunan. No statistical year or population count is given, so no population estimate is made.
Reference: 共姓_共姓的来源和历史_百家姓