Family name Masayama (Masayama 
) , all around the world, is a very rare last name. The family name Masayama is habitual in Japan, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Masayama is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Masayama | Japan, India, United States |