Family name بلاو (Blau 
, بلاو 
, Blauw 
) , in the entire world, is a common cognomen. The last name بلاو is habitual in Guam, where it is quite a common surname, Luxembourg, and Germany, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Germany, the United States, and Netherlands. Much less frequently, بلاو is the forename as well as the last name.