Family name Масу (Masu 
, Massu 
, Масу) , in the world, is quite a common cognomen. The last name Масу is characteristic of Botswana, where it is quite a rare surname, Papua New Guinea, and Cameroon. Not in comparison with a country's population, it most frequently occurs in India, Nigeria, and Italy. More frequently, Масу is the forename as well as the last name.