Family name Sieker (Sieker 
) , all around the world, is quite a rare cognomen. The family name Sieker is characteristic of Germany, where it is quite a rare surname, Denmark, where it is a rare surname, and the United States, where it is a very rare surname. In absolute terms, the name is most common in Germany, the United States, and Canada.
| VARIANT | COUNTRY |
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| Sieker | Greece, Canada, United States, Denmark, Germany |
| william f. sieker german-American politician in Wisconsin (1849–1930), US (b. 1849) |
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| hugo sieker German journalist and author, DE (b. 1903) |
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| karl-heinz sieker DE (b. 1905) |
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| egon sieker (b. 1938) |
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| jürgen sieker German photographer, DE (b. 1949) |
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| susanne sieker German university professor, DE (b. 1956) |
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| jakob t sieker researcher |
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| bernd manfred sieker Doktor Universität Bielefeld 2010 |
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| rakel svenstrup sieker Danish association football player |
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| meike sieker DE (b. 1977) |
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| heide sieker |
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