Family name Siwicka (Siwicka 
) , worldwide, is a rare cognomen. The cognomen Siwicka is characteristic of Poland, where it is a rare surname, Greece, and Canada, where it is a very rare surname. Measured by absolute frequency, it is commonest in Poland, Greece, and the United States. More frequently, Siwicka is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Siwicka | United Kingdom, Canada, United States, Poland, Greece |
| emilia siwicka PL (b. 1841) |
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| franciszka zofia siwicka PL (b. 1894) |
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| dorota siwicka (b. 1956) |
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| ewa siwicka researcher (ORCID 0000-0002-1109-698X) |
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| maria siwicka researcher (ORCID 0000-0001-5799-0365) |
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