As nomadic pastoralists, the Herero wandered across large tracts of land after embarking on their southerly migration from Kaokoland during the middle of the eighteenth century.The most striking feature of Herero social structure is the practice of double descent reckoning. According to this institution every person in society is linked to two distinct groups of relatives, of which the one is reckoned unilineally through the father and the other through the mother. Traditionally, the Herero pastoralists followed a nomadic way of life with their herds of cattle, as some of their kinsmen in Kaokoland still do.
Source: People of Namibia (JS Malan), Namibia Holiday & Travel