Where does “zor” come from?

zor (Serbo-Croatian) comes from Ottoman Turkish زور, from Persian زور, from Parthian zʿwr.

Ancestry of “zor”, step by step

Step	Language	Word	Meaning
1	Ottoman Turkish	زور	hard, difficult, exhausting; force, strength,...
2	Persian	زور	libation; force, strength, power, might;...
3	Parthian	zʿwr	—

zor — Etymology, Origin & Word History | Etymology Explorer