Blau (surname)

Blau is a surname of German origin, meaning "blue" in German. It likely originated as a descriptive nickname for someone with blue eyes, or perhaps someone who frequently wore blue clothing or worked with blue dyes.

The surname is found in various forms throughout German-speaking regions and amongst Ashkenazi Jewish communities. In Jewish contexts, it can also be an ornamental surname adopted later.

Variations of the name include, but are not limited to, Blue, Blaue, Blauer, and Blauel. The distribution of the surname is geographically widespread, reflecting the historical migrations and settlements of individuals and families bearing the name. Genealogical research is often necessary to trace the specific origins of a particular Blau family line.