Where does “దుర్గ” come from?

దుర్గ (Telugu) comes from Sanskrit दुर्गा, from Sanskrit गा, from Proto-Indo-European gʷeh₂- — to step.

Ancestry of “దుర్గ”, step by step

Step	Language	Word	Meaning
1	Sanskrit	दुर्गा	—
2	Sanskrit	गा	to go, go towards, come, approach; to go after,...
3	Proto-Indo-European	gʷeh₂-	to step