Surname Siefer (Зифер 
, Siefer 
) , worldwide, is a rare family name. The surname Siefer is characteristic of Western Europe, particularly Germany, where it is a rare surname, France, and Austria. Measured by absolute frequency, the name is most common in Germany, the United States, and France. Very seldom, Siefer is the forename as well as the last name.
| gregor siefer DE (b. 1928) |
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| elisabeth siefer (b. 1939) |
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| axel siefer German actor, DE (b. 1950) |
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| thomas siefer German university teacher, DE (b. 1956) |
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| heinrich siefer German writer, DE (b. 1959) |
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