An Etymological Dictionary of the German Language/grau

by Friedrich Kluge

grau, adj., ‘grey,’ from the equiv. MidHG. grâ (gen. grâwes), OHG. grâo (gen. grâwes); corresponding to Du. graauw, AS. grœ̂g, E. grey, gray, OIc. grár, ‘grey.’ Its origin and further relations cannot be traced; Aryan ghrêw?.