Surname Ros' (Рос 
, Ros', Рось 
) , in all the world, is quite a rare family name. The cognomen Ros' is habitual in Ukraine, where it is quite a rare surname, Estonia, where it is a rare surname, and Kazakhstan. Measured by absolute frequency, it is commonest in Ukraine, Russia, and Kazakhstan. Very seldom, Ros' is the forename as well as the last name.