Cognomen Тошиаки (Toshiaki 
, Тошиаки 
, Tochiaki ) , in the entire world, is quite a rare last name. The cognomen Тошиаки is habitual in Japan, where it is quite a rare surname, Singapore, where it is a rare surname, and Belgium, where it is a very rare surname. Measured by absolute frequency, the name is most common in Japan, China, and Indonesia. Very seldom, Тошиаки is the forename as well as the last name.