Where does “φαρμάκιν” come from?

φαρμάκιν (Byzantine Greek) comes from Ancient Greek φάρμακον, from Proto-Hellenic pʰármakon.

Ancestry of “φαρμάκιν”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	φάρμακον	A drug, whether healing or noxious; A healing...
2	Proto-Hellenic	pʰármakon	—

φαρμάκιν — Etymology, Origin & Word History | Etymology Explorer