The story
- Proto-Indo-European*déh₂nu
- Proto-Indo-Iranian*dáHnu
- Proto-Iranian*dáHnu
- Proto-Sarmatian*Δān
- Proto-Slavic*Donъ
- Old East SlavicДонъ (Donŭ)
- UkrainianДон (Don)
- UkrainianДонець (Donecʹ)
- UkrainianДоне́цьк (Donécʹk)
- English todayDonetsk
Borrowed from Ukrainian Доне́цьк (Donécʹk), from Донець (Donecʹ) + -цьк (-cʹk). Compare Russian Доне́цк (Donéck), Доне́ц (Donéc), Дон (Don).
Etymology from Wiktionary, CC BY-SA 4.0.