Where does “ղպտի” come from?

ղպտի (Middle Armenian) comes from Persian قبطی, from Arabic قِبْطِيّ.

Ancestry of “ղպտի”, step by step

Step	Language	Word	Meaning
1	Persian	قبطی	—
2	Arabic	قِبْطِيّ	—

ղպտի — Etymology, Origin & Word History | Etymology Explorer