a connection with Akk. nīnû is likely, but as Watson himself admits (2007:70), there is no need to postulate an Akkadian loanword in Ugaritic (cf. Pardee 1985:60 for related terms in other Semitic languages) (Kogan 2015: 365)
semantically very uncertain, neither Akk. nappītu ‘sieve’, nor Akk. nūptu ‘additional payment’ can be considered a reliable source of borrowing (Kogan 2015: 365).