Last name トシアキ (Toshiaki 
, トシアキ , Tosiaki 
) , globally, is a common surname. The family name トシアキ is habitual in Japan, where it is quite a common surname, Singapore, where it is a rare surname, and China, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Japan, China, and Indonesia. Much less frequently, トシアキ is the forename as well as the last name.