köken: Possibly non-Sino-Vietnamese reading of Chinese 梭 (“shuttle”, SV: thoa); as the correspondence between early ‹-oi› vs. late ‹-oa› is also seen in ngói vs. ngoã, the former from Old Chinese 瓦 (OC *C.ŋʷˤra[j]ʔ), the latter from Middle Chinese 瓦 (MC ngwaeX).
aile: con thoi, hình thoi, loi thoi, tàu con thoi, thuyền thoi
Uncertain. One possibility considered is a loan from Old East Slavic *съкальꙗ (*sŭkalĭja) (compare Russian скалья́ (skalʹjá)). Another is relation to sukkela (“quick, swift”) (as the shuttle is sent back and forth during weaving; compare the synonym syöstävä from syöstä). Related to Ingrian sukkulain, Karelian sukkula, sukkulaine, Ludian sukkulainʹe and Veps sukloine.