Where does “ку́хня” come from?

ку́хня (Russian) comes from Polish kuchnia, from Old Polish kuchnia, from Old High German chuhhina, from Proto-West Germanic kukinā, from Latin cocīna, from Latin coquīna, from Latin coquīnus, from Latin coquus.

Ancestry of “ку́хня”, step by step

Step	Language	Word	Meaning
1	Polish	kuchnia	—
2	Old Polish	kuchnia	—
3	Old High German	chuhhina	kitchen
4	Proto-West Germanic	kukinā	kitchen
5	Latin	cocīna	—
6	Latin	coquīna	—
7	Latin	coquīnus	—
8	Latin	coquus	A cook; person who makes food
9	Latin	coquō	—
10	English	Cook	—
11	German	kochen	to cook, to prepare food; to boil; to be stirred...
12	Middle High German	kochen	to cook
13	Old High German	kohhōn	to cook
14	Proto-Germanic	kukōną	to cook
15	Latin	coquere	second-person singular future passive indicative...
16	Proto-Italic	kʷekʷō	to cook
17	Proto-Indo-European	pékʷeti	to be cooking; to ripen
18	Proto-Indo-European	pekʷ-	to cook; to ripen
19	Proto-Indo-European	h₃-ép-kʷ-	—

Every word from Proto-Indo-European h₃-ép-kʷ- →

ку́хня — Etymology, Origin & Word History | Etymology Explorer