Blau Family History
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Blau Name Meaning
German: from Middle High German bla ‘blue’ (Old High German blao), applied as a nickname with various senses: someone who habitually wore blue clothes, a dyer, someone with blue eyes, a sickly or pale person, someone with a bluish complexion resulting from poor circulation, etc. Jewish (Ashkenazic): ornamental name, one of the many such Ashkenazic surnames taken from names of colors. Catalan: from blau ‘blue’.
Source: Dictionary of American Family Names ©2013, Oxford University Press