Where does “երթ” come from?

երթ (Armenian) comes from Old Armenian երթ, from Proto-Armenian er-cʿ-tʿi.

երթ (Armenian): moving, walking, driving in some direction;...

Definitions

Step	Language	Word	Meaning
1	Old Armenian	երթ	going, walking, march, procession, departure,...
2	Proto-Armenian	er-cʿ-tʿi	—

երթ — Etymology, Origin & Word History | Etymology Explorer