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Cognomen 大山 (大山 , Oyama , Оояма) , all around the world, is a common surname. The family name 大山 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. Also, 大山 is the forename as well as the last name.