man·ga·bey 
(mănggə-bā′, -bē′)
(mănggə-bā′, -bē′)n. pl. man·ga·beys
Any of various large forest-dwelling African monkeys of two genera, one (Cercocebus) consisting of chiefly terrestrial species, and the other (Lophocebus) consisting of chiefly arboreal species.
[After Mangabey, a place in Madagascar from which Georges Louis Leclerc de Buffon received specimens of the animals, which he erroneously believed were native to the island.]