Where does “Irpin” come from?

Irpin (English) comes from Ukrainian Ірпі́нь, from Ukrainian -і́нь, from Russian -ень, from Proto-Slavic *-ьnь.

Ancestry of “Irpin”, step by step

StepLanguageWordMeaning
1UkrainianІрпі́нь—
2Ukrainian-і́ньforms feminine nouns, predominantly singulars
3Russian-ень—
4Proto-Slavic*-ьnь—
Every word from Proto-Slavic *-ьnь →Every word from Russian -ень →Every word from Ukrainian -і́нь →