Last name Raou (Raou 
, Рау 
) , in the entire world, is quite a rare family name. The surname Raou is habitual in Kazakhstan, where it is quite a rare surname, Russia, where it is a rare surname, and Belarus. Not in comparison with a country's population, it is commonest in Kazakhstan, Russia, and Ukraine. Much less frequently, Raou is the forename as well as the last name.