Where does “достаканъ” come from?

достаканъ (Slavic) comes from Old East Slavic достоканъ, from Old Turkic dostaqan, from Persian dustgân, from Persian dôst.

Ancestry of “достаканъ”, step by step

Step	Language	Word	Meaning
1	Old East Slavic	достоканъ	—
2	Old Turkic	dostaqan	—
3	Persian	dustgân	—
4	Persian	dôst	—

достаканъ — Etymology, Origin & Word History | Etymology Explorer