Family name トシヤ (Toshiya 
, トシヤ , Tosiya 
) , around the globe, is a common last name. The family name トシヤ is characteristic of Japan, where it is quite a common surname, Singapore, where it is a rare surname, and Malaysia, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Japan, China, and Indonesia. Very seldom, トシヤ is the forename as well as the last name.