Something that isn't said often enough. The whites were in SA before the Central Africans. When the Dutch settlers began arriving, SA was populated with those tribes various called The San People, Bushmen, Hottentots, etc., the southern tribes that were shorter in stature than most humans.
The Central Africans, those most everyone thinks of as Africans, had been migrating southward gradually and the whites were already there when they began to arrive.