Cognomen Сьомин (Siomin 
, Сьомин , Syomin 
) , globally, is a rare family name. The last name Сьомин is characteristic of Azerbaijan, where it is quite a rare surname, Lithuania, where it is a rare surname, and Bulgaria. Not in comparison with a country's population, the name is most common in Azerbaijan, Ukraine, and Poland. Much less frequently, Сьомин is the forename as well as the last name.