Where does “دَكْ” come from?

دَكْ (Old Anatolian Turkish) comes from Old Turkic teŋ, from Middle Chinese 等.

Ancestry of “دَكْ”, step by step

Step	Language	Word	Meaning
1	Old Turkic	teŋ	equivalent, balanced; equal, equivalent,...
2	Middle Chinese	等	—

دَكْ — Etymology, Origin & Word History | Etymology Explorer