Surname Siess (西斯 
, Siess 
) , across the world, is quite a rare last name. The surname Siess is habitual in Austria, where it is quite a rare surname, Lithuania, where it is a rare surname, and Poland. Not in comparison with a country's population, it is the most numerous in the United States, Austria, and Germany. Very seldom, Siess is the forename as well as the last name.
| VARIANT | COUNTRY |
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| 西斯 | China |
| Siess | Germany, France, Poland, United States, Austria |
| placidus siess (b. 1642) |
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maksymilian siess UA (b. 1876) |
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| napoleon siess Polish conductor, PL (b. 1931) |
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michał siess Polish fencer, PL (b. 1994) |
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| jürgen siess (b. 1942) |
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| cezary siess Polish fencer, PL (b. 1968) |
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| walter siess AT (b. 1959) |
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| roman siess AT (b. 1968) |
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| vincent siess Ph.D. Université Pierre-et-Marie-Curie - Paris VI 2004 |
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| wolfgang siess researcher ORCID ID = 0000-0003-0698-6416 |
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| rosalie beuret siess CH (b. 1978) |
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