Surname Руах (Ruah 
, Руах 
) , in the entire world, is a rare last name. The surname Руах is characteristic of Portugal, where it is quite a rare surname, Kenya, where it is a rare surname, and Malaysia, where it is a very rare surname. In absolute terms, the name is most common in Indonesia, Kenya, and Portugal. Much less frequently, Руах is the forename as well as the last name.