Where does “Красногорск” come from?

Красногорск (Russian) comes from Russian кра́сный, from Old East Slavic красьнъ, from Proto-Slavic krasьnъ, from Proto-Slavic krasa, from Proto-Indo-European kreH- — to shout.

Ancestry of “Красногорск”, step by step

Красногорск traces back through two separate lines of ancestry.

via Russian кра́сный

StepLanguageWordMeaning
1Russianкра́сныйred; red; beautiful
2Old East Slavicкрасьнъbeautiful
3Proto-Slavickrasьnъbeautiful
4Proto-Slavickrasabeauty
5Proto-Indo-EuropeankreH-to shout

via Russian гора́

StepLanguageWordMeaning
1Russianгора́mountain, heap
2Proto-Slavicgoràmountain
3Proto-Balto-Slavicgarā́ˀmountain
4Proto-Indo-EuropeangʷerH-to express approval; praise; to elevate
Every word from Proto-Indo-European kreH- →Every word from Proto-Slavic krasa →Every word from Proto-Slavic krasьnъ →