Where does “ܒܕܘܠ” come from?

ܒܕܘܠ (Classical Syriac) comes from Classical Syriac ܒ-, from Aramaic ב־ — in; at; with.

Ancestry of “ܒܕܘܠ”, step by step

Step	Language	Word	Meaning
1	Classical Syriac	ܒ-	various senses: in, on, upon, at, among, to,...
2	Aramaic	ב־	in; at; with