Cognomen Grabau (Grabau 
) , in the entire world, is quite a rare family name. The family name Grabau is characteristic of Germany, where it is quite a rare surname, Denmark, where it is a rare surname, and the United States. Measured by absolute frequency, this name is the most popular in Germany, the United States, and Italy. Much less frequently, Grabau is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Grabau | Germany, Belgium, Italy, Australia, United States |
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johannes andreas august grabau German theologian, US (b. 1804) |
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| friedrich wilhelm grabau German politician (1783-1839), DE (b. 1783) |
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| carl von grabau DE (b. 1784) |
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| karl grabau DE (b. 1784) |
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| julie grabau DE (b. 1797) |
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| andreas grabau DE (b. 1808) |
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| johann andreas grabau DE (b. 1808) |
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| johann heinrich wilhelm grabau DE (b. 1809) |
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| christian grabau DE (b. 1810) |
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amadeus william grabau American scientist, US (b. 1870) |
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| andreas hermann grabau (b. 1837) |
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| johannes andreas grabau (b. 1842) |
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| richard grabau (b. 1846) |
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| marcello grabau Italian politician, IT (b. 1875) |
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| gustav grabau German politician (1888-1977), DE (b. 1888) |
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