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Family name בלאו (Blau , בלאו , Blaeu ) , worldwide, is a common surname. The cognomen בלאו 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, בלאו is the forename as well as the last name.