Mand. pl. qulalia (fem.!), perhaps with a single example of the extra syllable in the singular as an error or a back-formation; see MD

From Akkadian qullu, a metal fastening device used both as a lock and as a piece of jewelry; see CAD Q p. 298. Thus we have vocalized it accordingly.
The Syriac expression ܩܘܠܐ ܕܨܘܪܐ (q.v.) "collar" abrogates the comment in DJBA about the Geonic discussion.