Namatania's name came from the tribes which lived in the lands when the first Roman explorers arrived in the late 19th century.
The Roman conquests of southern Africa were one of the least regulated when compared to any previous expansion. Legions that were virtually privateers followed well-off patricians into the depths of Africa, searching for anything ranging from mythical treasures to simple fame and fortune. In Simbabwe in particular, the native population was decimated and indifferently slaughtered. Many fled north to what would soon be called Namatania, a trend which lowered Simbabwe's population and stifled rebellion, but also made Namatania much more violent. As a Roman province, ethnic friction was a severe problem with the Simbabwean refugees having settled down and challenging other established tribes. native African warfare was common before, but Roman atrocities starting around the beginning of the 20th century and continuing for 50 years made the situation extremely gruesome. From the viewpoint of Europe, Simbabwe and Namatania were seen almost as twin provinces, except Namatania was sort of seen as the evil twin and Simbabwe was considered the good obedient twin.
Another unfortunate occurrence was that the rampaging legions didn't always stick around to claim and stabilise land, so paths of destruction cut through Africa, contributing to its modern predicament of perpetual civil and ethnic war. Even during Africa's eventual rise under the control of corporations, the scar of Rome was similar to OTL Mongol conquests of Russia.