Cognomen Siejka (Siejka 
) , all over the world, is quite a rare surname. The family name Siejka is characteristic of Poland, where it is quite a rare surname, Australia, where it is a rare surname, and Brazil, where it is a very rare surname. In absolute terms, the name is most common in Poland, Brazil, and the United States. Likewise, Siejka is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Siejka | United Kingdom, Poland, Australia, Brazil, United States |
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piotr siejka Polish actor, PL (b. 1960) |
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jo siejka Australian politician, AU (b. 1980) |
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harry siejka Australian rugby league player, NZ (b. 1992) |
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| lucyna siejka-juzwa Polish field hockey player, PL (b. 1962) |
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| piotr siejka Polish keyboardist, PL (b. 1973) |
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| filip siejka Polish violinist, PL (b. 1975) |
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| dylan a siejka researcher (ORCID 0000-0003-1080-4451) |
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| sebastian siejka physicist at Warsaw University of Technology |
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| sławomir siejka PL |
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