Cognomen Ирияма (入山 
, Iriyama 
, 込山 ) , in the entire world, is a rare surname. The surname Ирияма is habitual in Norway, where it is a very rare surname, Japan, and China, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in China, Japan, and the United States. Likewise, Ирияма is the forename as well as the last name.