Grau

* As a German surname, borrowed from German Grau, a nickname for someone with grey hair or beard. * As a Catalan and southern French surname, from Occitan and Catalan Grau, a topographic surname from grau (“degree, level”). * Also as a Catalan surname, reduced from the personal name Guerau; see Gerald. * As a French surname, from Old French grau (“kind of fork”), from Frankish/Germanic, probably related to Old Norse grein (“fork, branch”).