Cognomen Taichi (Taichi 
, タイチ , Таичи 
) , in the world, is a common last name. The last name Taichi is characteristic of Japan, where it is quite a common surname, Singapore, where it is a rare surname, and Morocco, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Japan, China, and Indonesia. Much less frequently, Taichi is the forename as well as the last name.