Surname Симьонов (Simionov 
, Симьонов 
) , throughout the world, is a rare family name. The family name Симьонов is habitual in Romania, where it is quite a rare surname, Lithuania, where it is a rare surname, and Bulgaria. In absolute terms, this name is the most popular in Romania, Italy, and Bulgaria. Very seldom, Симьонов is the forename as well as the last name.