Last name Sierek (Sierek 
) , in the entire world, is a rare family name. The surname Sierek is habitual in Austria, where it is a rare surname, Poland, and Germany, where it is a very rare surname. Likewise, Sierek is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sierek | Austria, Poland, Germany, United States |
| karl sierek (b. 1952) |
|
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| martin sierek AT (b. 1958) |
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| katarzyna sierek researcher |
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