Cognomen マサトシ (Masatoshi 
, マサトシ , Masatosi 
) , in all the world, is a common family name. The last name マサトシ is characteristic of Eastern Asia, particularly Japan, where it is quite a common surname, Taiwan, where it is quite a rare surname, and Hong Kong, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Eastern Asia, particularly Japan, China, and Taiwan. Very seldom, マサトシ is the forename as well as the last name.