Even if the identification with Akk. šēḫtu (Pardee 2000: 310) is accepted, it seems wise to follow Pardee’s dictum “ľorigine du mot est inconnue” (Kogan 2015: 360).
Ugaritic
ˀuṯkl - bunch of grapes
(DUL 125; Watson 2004: 120)
Even if this interpretation is maintained (which is far from obvious), there is hardly any need to postulate an Akkadian loanword in Ugaritic, all the more since none of the three ušultu words listed in CAD U 329 displays a suitable meaning (Kogan 2015: 360).
= Akk. išpatu. The origin of this common lexeme, widely attested in a variety of ANE languages, is uncertain, an Akkadian loanword in Ugaritic is unprovable (Kogan 2015: 358).
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).