Surname Gronau (Gronau 
, גרונאו 
) , globally, is quite a common last name. The family name Gronau is habitual in Germany, where it is quite a rare surname, Puerto Rico, and Austria. Measured by absolute frequency, this name is the most popular in Germany, the United States, and Austria. Very seldom, Gronau is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gronau | Germany, Austria, Paraguay, United States, Poland |
| גרונאו | Israel |
| hermann gronau (b. 1480) |
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| jan gronau (b. 1585) |
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| daniel magnus gronau PL (b. 1685) |
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| johann hermann gronau German theologian, DE (b. 1708) |
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| israel christian gronau (b. 1714) |
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| karl ludwig gronau German theologian, meteorologist and astronomer (1742-1826), DE (b. 1742) |
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| wilhelm gronau (b. 1778) |
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| johann carl ludwig gronau (b. 1778) |
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hans von gronau German general, DE (b. 1850) |
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| johann friedrich wilhelm gronau (b. 1803) |
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| eduard gronau (b. 1845) |
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| george gronau PL (b. 1860) |
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| georg gronau IT (b. 1868) |
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| karl gronau German university professor, DE (b. 1885) |
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| ernst gronau German actor, LT (b. 1887) |
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