sentences:  The first syllable may, on the other hand, be a colour, from the Germanic "hasa", "hasan" (Old English "hasu"), meaning “grey”, which would mean that the name as a whole means “Greybrook”.If so, another pattern is seen when the name is put alongside Blaubach, Schwarzbach, Rotenbach (“Bluebrook”, “Blackbrook”, “Redbrook”), etc.Researchers Dolch and Greule put forth a further idea.