Cognomen Rietz (Rietz 
, Риц 
) , across the world, is quite a rare last name. The last name Rietz is characteristic of Namibia, where it is quite a rare surname, Sweden, and Germany. In absolute terms, it most frequently occurs in Germany, Sweden, and the United States. Very seldom, Rietz is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rietz | Namibia, Poland, United States, Germany, Sweden |
| Риц | Russia, Ukraine, Kazakhstan |
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grégoire francois du rietz French physician, FR (b. 1607) |
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anders rudolf du rietz Swedish general, count and politician, SE (b. 1722) |
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julius rietz German musician, DE (b. 1812) |
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| carin du rietz Swedish woman soldier, SE (b. 1766) |
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johan ernst rietz SE (b. 1815) |
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| johann friedrich rietz (b. 1767) |
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hugo william du rietz Australian architect, AU (b. 1831) |
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| friedrich august rietz DE (b. 1795) |
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arthur du rietz SE (b. 1855) |
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axel rietz SE (b. 1860) |
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einar du rietz Swedish botanist (1895-1967), SE (b. 1895) |
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| friedrich rietz DE (b. 1840) |
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| ernst rietz SE (b. 1847) |
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hans rietz German politician (1914-1996), DE (b. 1914) |
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| henry lewis rietz American mathematician, actuarial scientist, and statistician., US (b. 1875) |
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