Probably from manikin. or: Compare Frenchmanakin, GermanManakin; probably from the native name.
Alteration of manikin
American Heritage Dictionary of the English Language, 5th Edition
Manakin Sentence Examples
Next he places the parrots (q.v.), and then the vast assemblage of " Passereaux "- which he declares to be all of one type, even genera like Pipra (manakin, q.v.) and Pitta - and concludes with the somewhat heterogeneous conglomeration of forms, beginning with Cypselus (swift, q.v.), that so many systematists have been accustomed to call Picariae, though to them as a group he assigns no name.
Bird highlights here included streaked flycatcher, white shouldered tanager, crested guan and orange collared manakin.
Army ant swarms are found frequently, sometimes attended by Rufous-vented Ground-Cuckoo, and there are many manakin leks right beside the road.