Ukaan is an undocumented and sparsely described Niger–Congo language or dialect cluster of uncertain affiliation.
Roger Blench

Roger Blench

Roger Blench is a British linguist, ethnomusicologist and development anthropologist. He has an M.A. and a Ph.D. from the University of Cambridge and remains based in Cambridge, England...

 suspects, based on wordlists, that it may be closest to the (East) Benue–Congo languages (or, equivalently, the most divergent of the Benue–Congo languages).

The name Anyaran is from the town of Anyaran, where it is spoken. Ukaan has several divergent dialects: Ukaan proper, Igau, Ayegbe (Iisheu), Iinno (Iyinno), which may only have one-way intelligibility in some cases.