My grandfather's surname is Shi, and his hometown is Shijiagou, Tieling, Liaoning. What should the Manchu surname be?

Manchu people take many stone surnames, such as:

Skeeter richter, Weller's, Samara's, Shumlu's, Hiljia's, Guajia's, Shifucha's, Hongluoshi's, Zakuta's and so on.

Because there is no reliable clue at present, it is difficult to say which family your grandfather's surname is.

My guess is that Shumru or Guarga is a little more likely. Just guessing.

I suggest you go to Shijiagou, your grandfather's hometown, find a distant relative of this family and consult the genealogy.