Where does “ترك” come from?

ترك (Moroccan Arabic) comes from Arabic ترك, from Arabic تُرْك — Turks.

Ancestry of “ترك”, step by step

Step	Language	Word	Meaning
1	Arabic	ترك	to leave, to relinquish; verbal noun of تَرَكَ;...
2	Arabic	تُرْك	Turks