My surname is Jin Manchu. I don't know where my Manchu surname is.

Manchu surname has nothing to do with the flag genus, so it is impossible to check the flag genus by surname. The flag genus in Qing dynasty is just like the current work unit, so it is impossible to find a work unit because of the surname. Only by determining the name, time and place can we find out the flag genus of the Qing Dynasty.

I suggest looking for the old surname first.

Kim:

The earliest surname of China used by Manchu people was Gulun, and that of China people was Jin. According to the North Korean ancient book "A Record of the Li Dynasty", the Nuzhen governor in the north of Tieling lost thousands of houses and posts, and took Jin as his surname.

The old surnames are: Ai Xinjue Roche, Jin Jiashi, Jingji, Jinggeli, Solz, Niu Zhilu, and Jin (Korean, Han) who entered Man.