Where does “ետեւ” come from?

ետեւ (Middle Armenian) comes from Old Armenian ետ, from Old Armenian հետ — foot; footstep, footprint, track; trace, vestige;...

Ancestry of “ետեւ”, step by step

Step	Language	Word	Meaning
1	Old Armenian	ետ	after; third-person singular aorist active...
2	Old Armenian	հետ	foot; footstep, footprint, track; trace, vestige;...