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Family name Сямёнаў (Semenov , Semyonov , Сямёнаў ) , across the world, is a common surname. The cognomen Сямёнаў is habitual in Estonia, where it is quite a common surname, Reunion, and Lithuania. In absolute terms, the name is most common in Russia, Israel, and Romania. Much less frequently, Сямёнаў is the forename as well as the last name.