Family name Gaab (Gaab 
, Гааб 
) , throughout the world, is quite a rare last name. The last name Gaab is characteristic of Germany, where it is quite a rare surname, Switzerland, where it is a rare surname, and Kazakhstan. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Argentina.
| VARIANT | COUNTRY |
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| Gaab | Germany, Saudi Arabia, Philippines, United States, Argentina |
| Гааб | Kazakhstan, Russia, Ukraine |
| johann friedrich gaab German theologian, DE (b. 1761) |
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| karl ulrich gaab (b. 1767) |
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| ludwig friedrich gaab German architect, DE (b. 1800) |
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| emilie gaab (b. 1803) |
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| christian gaab DE (b. 1828) |
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| heinrich gaab (b. 1851) |
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| hannes gaab (1908-1988), DE (b. 1908) |
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| larry gaab American composer, US (b. 1950) |
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| hans gaab (b. 1956) |
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| hans gaab DE (b. 1956) |
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| jens gaab researcher (b. 1970) |
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| judith gaab (b. 1967) |
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| nadine gaab researcher |
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| gaab soo kim researcher (ORCID 0000-0002-9383-2652) |
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| hans gaab Ph.D. Universität Regensburg 2009 |
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