Family name Сянько (Сянько 
, Syanko) , across the world, is an extremely rare surname. The family name Сянько is habitual in Eastern Europe, particularly Ukraine, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Сянько | Ukraine |
| фёдар пятровіч сянько Soviet economist (1936-2020), BY (b. 1936) |
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| уладзімiр лявонавiч сянько Belarusian diplomat, BY (b. 1946) |
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| веньямін іванавіч сянько Belarusian university teacher, BY (b. 1946) |
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| ілья пятровіч сянько BY (b. 1940) |
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