>
Surname Blau (Blau
, بلاو
, בלאו
) , in the entire world, is a common family name. The cognomen Blau is characteristic of Guam, where it is quite a common surname, Luxembourg, and Germany, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and Brazil. Very seldom, Blau is the forename as well as the last name.