Semyonov (masculine), also transliterated as Semenov, Semenoff, and Semionov (Russian: Семёнов), or Semyonova (Semenova, Semionova) (feminine) is a common Russian last name. Its etymology is the "son of Semyon" or "belonging to Semyon", where "Semyon" is a Russian given name that corresponds to Simeon, Simon.