The northernmost and least governed of the Ming's three Jurchen groupings: the tribes of the Heilongjiang, lower Sungari and Ussuri whom Chinese officials called 'wild people' because they kept no standing tribute relationship. Their descendants did not become Manchus but Nanai, Udege, Oroqen, Negidal and Nivkh.
Not an ending: Hong Taiji's armies brought the whole Amur country under Manchu authority by 1643 and the Ming's 'wild Jurchen' label lapsed with the Ming, but the Hurha, Weji and Warka tribes themselves continued as the Amur peoples - some entered the Qing banners, most simply paid fur tribute and kept their river villages.
Ginseng and Borderland: Territorial Boundaries and Political Relations between Qing China and Choson Korea, 1636-1912Seonmin Kim · 2017
Names the constituent Wild Jurchen tribes (Hurha, Weji/Udike, Warka) and explains the Ming category and the Nurgan commission that nominally covered them.
A History of the Peoples of Siberia: Russia's North Asian Colony 1581-1990James Forsyth · 1992
The seventeenth-century Amur from the native side - 'Juchers' below the Zeya, Manchu subjection by 1643, banner organisation in the 1650s.