Last name Siwko (Siwko 
) , globally, is a rare cognomen. The surname Siwko is habitual in Poland, where it is quite a rare surname, the United States, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Also, Siwko is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Siwko | Poland, United Kingdom, United States |
| stefan k siwko researcher ORCID ID = 0000-0003-4260-2985 |
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| john ireneusz siwko Ph.D. University of California, Los Angeles 1999 |
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