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Cognomen Sianko (Sianko
, Сианко
) , all around the world, is a rare last name. The family name Sianko is habitual in Lithuania, where it is a rare surname, Belarus, and Poland. In absolute terms, it is commonest in Eastern Europe, particularly Poland, Belarus, and Russia. Also, Sianko is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sianko | Poland, Greece, Lithuania, United States, Belarus |
| Сианко | Russia |