Family name Runau (Runau 
) , in all the world, is a rare cognomen. The surname Runau is habitual in Germany, where it is a very rare surname, Netherlands, and Spain. Not in comparison with a country's population, the name is most common in Germany, the United States, and Spain. Likewise, Runau is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Runau | Germany, Spain, India, United States, Poland |
| ralf runau German chess player (b. 1952) |
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| dorit runau (b. 1970) |
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| karl runau German musician |
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| franscois runau researcher |
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