Blau

Blau is a German surname derived from the adjective blau, meaning "blue." The name most likely referred to a person who habitually wore blue clothing, a common practice in occupational and descriptive surnames in German-speaking regions. Blue was a relatively rare color in pre-modern times, often associated with the Virgin Mary (hence "Marienblau") and later with artisans such as indigo dyers who used blue dye.

Etymology

The word blau comes from Middle High German blā (cognate with English blue, Dutch blauw). A person called "Blau" would typically have a distinguishing characteristic—like always wearing blue garments—or might have been a cloth dyer or painter specializing in blue pigments. Surnames based on colors (such as Weiß 'white', Rot 'red', Schwarz 'black') were especially common in the German countryside, where they identified individual families before hereditary surnames became fixed.

Notable Bearers

Several figures have popularized the surname Peter Blau (1918–2002), an American-born Austrian writer known for his experimental literature. In science, the surname appears in medicine, such as Eugen Blau and a German physician who identified what came to be called Blau syndrome, a rare autosomal dominant inflammatory disorder. There is also the Blau family of architects in Germany, alongside the historic firm Blau Gas, which manufactured high-quality camping stoves.

Cultural Significance

In German onomastics, symbolic or color surnames often indicated trade or social status. The choice of blue—widely available in nature as sky and sea—implied a certain coolness or piety in medieval Christian context. Through migration, the surname Blau traveled to other parts of the world particularly to the United States and Latin America, where, although less common, it keeps its crisp simplicity. Notable kin names like the English Blue exist as well but lack the n initial history connected deep-yet-integral usage to which Blau testifies.

• Meaning: "blue" (the color)
• Origin: German
• Type: Surname (occupational/descriptive)
• Regions most common: Germany, Austria, United States