Cognomen Масаси (Masashi 
, Masasi 
, Масаси 
) , globally, is a common family name. The cognomen Масаси is characteristic of Tanzania, where it is quite a common surname, Zimbabwe, where it is quite a rare surname, and Japan. In absolute terms, it most frequently occurs in Tanzania, Japan, and China. Very seldom, Масаси is the forename as well as the last name.