The meaning ‘swallow’ is conjectural since the word is attested only as a divine designation in 1.17 II 27 and parallel passages: ˁrb bbth kṯrt // bnt hll snnt kṯrt ‘entered his house // daughters of the light, swallows’
quite uncertain (cf. Pardee 2002a: 95), but even if accepted, Akk. siparru ‘bronze’ is an old Wanderwort so that an Akkadism in Ugaritic is hard to prove