Last name こうへい (Kohei 
, こうへい, Kōhei) , around the world, is quite a rare family name. The family name こうへい is habitual in Japan, where it is a rare surname, Singapore, and Cambodia, where it is a very rare surname. In absolute terms, it most frequently occurs in Japan, China, and Indonesia. Also, こうへい is the forename as well as the last name.