Cognomen โอยามะ (Ohyama 
, Ooyama 
, โอยามะ 
) , in the entire world, is a rare surname. The surname โอยามะ is habitual in Japan, where it is a very rare surname, Argentina, and the United States. Likewise, โอยามะ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ohyama | Japan, China, United States, Argentina, Brazil |
| Ooyama | Japan, United States, Philippines |
| โอยามะ | Thailand |