sentences:  Folk etymology holds a different explanation of the name’s derivation.According to this, the name Grumbach is to be understood as meaning “green brook” (this would be "grüner Bach" in Modern High German), a name for the stream, for its colour, presumably due to the presence of bits of plant matter, which would be accounted for by mediaeval views of nature.Other forms that the name Grumbach has taken over the ages are "Castrum Grunebach" (1243), "Grunenbach" (1258), "Grunbach" (1265), "Grumbach" (1353), "Gronbach" (1393), "Grumbech" (1399) and "Grombach" (1514).