Last name 山森 (Yamamori 
, 山森 ) , in the world, is a rare surname. The surname 山森 is habitual in Isle of Man, where it is quite a rare surname, Japan, where it is a very rare surname, and the United States, where it is an extremely rare surname. In absolute terms, it is commonest in Japan, China, and the United States. More frequently, 山森 is the forename as well as the last name.