The Hokkien and Teochew romanization of Hong (that uses the character 洪) is Ang, which is also used for Wang (汪, Wāng).
The Gonggongs directed irrigation works and managed flood control on the west bank of the Yellow River in the southeast corner of the Ordos Loop above the Wei.
The future Ku Emperor led an army against the rebellion and crushed them at the Battle of Bei Zhou Shan.
The Gonggong were reinstated in their former position only to provoke widespread flooding under the Yao Emperor when they opposed some of his orders.
When the Chinese ceased to have both ancestral and clan names, many Gonggongs combined the water radical from jiang with the character gong to produce Hong.