Last name Sienko (Sienko 
, Сиенко 
, Sieńko ) , in the world, is quite a rare family name. The surname Sienko is habitual in Poland, where it is quite a rare surname, Denmark, where it is a rare surname, and Russia. In absolute terms, it is the most numerous in Poland, the United States, and Russia. Also, Sienko is the forename as well as the last name.
| michell j. sienko American chemist, US (b. 1923) |
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| susan sienko researcher |
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| kathleen h sienko researcher |
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| chris sienko US |
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