Cognomen ולאסוב (Vlasov 
, ולאסוב 
, Vlasovs 
) , all over the world, is quite a common surname. The cognomen ולאסוב is characteristic of Latvia, where it is quite a common surname, Cyprus, and Moldova, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Russia, Uzbekistan, and Moldova. Very seldom, ולאסוב is the forename as well as the last name.