The term is often thought to be borrowed from Sum. UZ, but the Sum. term itself is likely to be an early Semitism (as suggested in Landsberger 1966: 257, cf. also Salonen 1973: 288-9).
Akk. ūsu ‘duck’. A widely attested cultural term with no certain etymology (cf. SED II No. 22), Akkadian loanword in Ugaritic is unprovable (Kogan 2015: 358).
An Amharism, according to Leslau. The word is certainly related though the phonetic developments presupposed by this relationship are totally obscure, v. SED II 32.