Where does “trȉjās” come from?

trȉjās (Serbo-Croatian) comes from Ancient Greek τρῐάς — triad, the number three.

Ancestry of “trȉjās”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	τρῐάς	triad, the number three

trȉjās — Etymology, Origin & Word History | Etymology Explorer