Family name Sierk (Sierk 
) , around the globe, is a rare cognomen. The cognomen Sierk is characteristic of Germany, where it is a rare surname, Israel, where it is a very rare surname, and New Zealand. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and France. Very seldom, Sierk is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sierk | Germany, Australia, United States, France, Netherlands |
| sierk coolsma Dutch missionary, NL (b. 1840) |
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| sierk schaafsma Dutch Righteous Among the Nations, NL (b. 1906) |
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| hans willy sierk (b. 1909) |
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sierk radzei German stage actor, DE (b. 1977) |
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| herbert allen sierk American lichenologist, US (b. 1932) |
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| sierk willem rosema Ph. D. Universiteit Leiden 2008 |
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| sierk de jong researcher |
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| anika sierk researcher (ORCID 0000-0002-1396-8075) |
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| michael sierk researcher |
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| sierk marbus researcher |
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| tanja sierk German association football player, DE (b. 1985) |
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| sierk schmalzriedt DE (b. 1978) |
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| lotte sierk |
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