In the TL I'm doing I've had Arab slavers from the Sudan and Zanzibar establish their own "commercial" empire in what is now southern Chad, the Central African Republic, north-eastern Congo/Kinshasa, and south-western Sudan. This is taking place in the late 19th century as a reaction to European efforts to end slavery (the POD is in 1862). I've had plenty of instances in OTL to be influenced by, although on a smaller scale (the Sudanese Zubayr Pasha, the Zanzibari Tippu Tip).
So, any thoughts on the plausibility and workings of such a state? And how do I name it (someone with a knowledge of Arabic would be helpful here)?