OS MtCur12:23 :ܘܐܡܪܝܢ ܗܘܘ ܕܕܠܡܐ ܟܝ ܗܢܘ ܒܪܗ ܕܕܘܝܕ‏ : they were saying: could this be the son of David?
See the entire entry for kay conj. enclitic suggesting doubt, question, or desire