Family name Грау (Grau 
, Graou 
, Грау 
) , around the world, is a common surname. The family name Грау is habitual in Andorra, where it is quite a common surname, Paraguay, and Spain (explore the name in all countries). In absolute terms, the name is most common in Germany, Spain, and the United States. Much less frequently, Грау is the forename as well as the last name.