Surname Ояма (小山 
, Oyama 
, Ojama 
, along with others...) , all around the world, is a common cognomen. The family name Ояма is habitual in Sub-Saharan Africa, particularly Gabon, where it is quite a rare surname, Nigeria, and Cameroon. Measured by absolute frequency, it is commonest in Nigeria, China, and Brazil. Likewise, Ояма is the forename as well as the last name.