Surname Siemienowicz (Siemienowicz 
, Семенович 
) , worldwide, is quite a common cognomen. The family name Siemienowicz is characteristic of Kazakhstan, where it is quite a common surname, Belarus, and Ukraine, where it is quite a rare surname. In absolute terms, it most frequently occurs in Kazakhstan, Ukraine, and Russia. Very seldom, Siemienowicz is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siemienowicz | Poland, United Kingdom, United States, Australia |
| Семенович | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
Semenovich, Semenovitch, Semenovič, Semenowicz, and Semenowitsch
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kazimierz siemienowicz Polish military engineer and artillery officer (b. 1600) |
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| zbigniew siemienowicz Lithuanian politician, LT (b. 1958) |
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| jarosław siemienowicz PL (b. 1964) |
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| rochelle siemienowicz Australian film critic |
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