Cognomen Demenova (Деменова 
, Demenova 
) , in all the world, is a rare surname. The family name Demenova is characteristic of Kazakhstan, where it is a rare surname, Belarus, where it is a very rare surname, and Russia. Measured by absolute frequency, it is the most numerous in Russia, Kazakhstan, and Ukraine. Much less frequently, Demenova is the forename as well as the last name.