An A. I. generated image of 27-year-old black women in South Africa. Race The majority of South Africa are black people, South Africa has an over 80% black majority. Gender South Africa has slightly more females than males. Language / Ethnicity The most populous ethnicity in South Africa is the Zulu nation. Their language is also the most spoken language in South Africa. Age The median age of South Africa's population is 27.7 years. Name The most common name in South Africa is Johannes, the most common female name is Maria & the most common indigenous name is Sibongile. Surname The most common surname in South Africa is Dlamini. The most common person in South Africa is a Zulu-speaking, 28-year-old black woman with the names Maria Sibongile Dlamini.