Cognomen Тосико (Toshiko 
, Tosiko 
, Тосико 
) , throughout the world, is quite a rare last name. The surname Тосико is characteristic of Japan, where it is a rare surname, Spain, where it is a very rare surname, and Indonesia. In absolute terms, it most frequently occurs in Japan, China, and Indonesia. Much more frequently, Тосико is the forename as well as the last name.