* Unrau: This surname likely comes from the German word "Unruh" meaning "restlessness" or "turmoil". It could have been given to someone who was known for being restless, or it might have been a descriptive name for a place that was turbulent.
* Unruh: This surname is a bit more complex. It could also be derived from the German word "Unruh" meaning "restlessness" or "turmoil". However, it could also be a variant of the surname "Unru", which is a place name meaning "unruly" or "wild".
While both surnames share a similar root word, they have different historical and geographical origins. It's possible that they developed independently in different regions of Germany.
It's important to note that genealogical research is crucial to determine the exact origins and connections between any two surnames. You might find that there are instances of individuals with these surnames who are related, but that would be a result of individual family histories, not a direct connection between the surnames themselves.