[1][2]Ukaan (nke a na-akpọkwa Ikan, Anyaran, Auga, ma ọ bụ Kakumo) bụ asụsụ Niger–Congo nke akọwara nke ọma ma ọ bụ ụyọkọ olumba nke njikọ ejighị n'aka.↵Roger Blench na-enyo enyo, dabere na listi okwu, na ọ nwere ike bụrụ ihe kacha nso na (East) Benue–Congo (ma ọ bụ, n'otu aka ahụ, Nke kacha dị iche na Benue-Congo [3] (2012) na-ekwu na "aha na nkwekọrịta na-eme ka ọ dị ka Benue-Congo, mana ihe akaebe adịghị ike".
Ndị na-asụ ya na-akpọ asụsụ ha Ùkãã ma ọ bụ Ìkã . [4]
Aha Anyaran sitere n'obodo Anyaran, ebe a na-asụ ya. Ukaan nwere ọtụtụ olumba dị iche iche: Ukaan kwesịrị ekwesị, Igau, Ayegbe (Iisheu), Iinno (Iyinno), nke nwere naanị nghọta otu ụzọ n'ọnọdụ ụfọdụ.
Roger Blench (2005, 2019)[5] weere na Ukaan nwere ma ọ dịkarịa ala asụsụ atọ dị iche iche, ma kwuo na ụdị Ukaan dị iche iche a na-asụ n'Ishè, Ẹkakumọ, na Auga niile nwere ụdị lexeme dị iche iche.[4]) [5]
Salffner (2009: 27) [6] depụtara asụsụ anọ na-esonụ nke Ukaan.
Ethnologue depụtara ebe ndị a ebe a na-asụ Ukaan.
Blench (2019) depụtara Ondo State, Akoko North LGA, obodo Kakumo-Aworo (Kakumo-Kejĩ, Auga na Iṣe); Edo State, Akolo Edo LGA,obodo Kakumo-Akoko na Anyaran.
Abiodun wughachila Proto-Ukaan (1999). [7]