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Cognomen Oyama (小山 , オヤマ , Oyama ) , worldwide, is a common surname. The cognomen Oyama is characteristic of Sub-Saharan Africa, particularly Gabon, where it is quite a rare surname, Nigeria, and Cameroon. In absolute terms, the name is most common in Nigeria, China, and Brazil. More prevalently, Oyama is the forename as well as the last name.