Melland gives chipekwe as referring to a one-tusked elephant in the Kaonde language of Zambia. This is probably irrelevant.
The Chipekwe is a massive, allegedly reptilian, pachyderm-slaying creature found around and in Lake Bangweulu in Zambia. Most encounters consist of unrecognizable spoors, or the noise of some large animal splashing through the water.
A chipekwe has a hairless, smooth, dark body and a single smooth horn, white as polished ivory. Chipekwes do not take well to humans invading their territory. Canoes are destroyed and their occupants are killed. Hippos fare no better – the chipekwe kills them by tearing their throats out. At least one chipekwe is known to have been slain in the Luapula, brought down by the same large harpoons used for hippo hunting.
All of the above could very well be exaggerated references to one-tusked elephants. This is probably relevant.
Mackal, R. (1987) A living dinosaur? E. J. Brill, New York.
Melland, F. H. (1923) In Witch-bound Africa. J. B. Lippincott Company, Philadelphia.