Cognomen Тосиаки (Toshiaki 
, Tosiaki 
, Тосиаки 
) , in the entire world, is quite a rare last name. The cognomen Тосиаки is characteristic of Japan, where it is quite a rare surname, Singapore, where it is a rare surname, and Belgium, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Japan, China, and Indonesia. Very seldom, Тосиаки is the forename as well as the last name.