Where does “кладьнъ” come from?

кладьнъ (Church Slavonic) comes from Slavic брѣза, from Proto-Slavic bèrza, from Proto-Balto-Slavic berźas, from Proto-Indo-European bʰerHǵos — birch.

Ancestry of “кладьнъ”, step by step

StepLanguageWordMeaning
1Slavicбрѣза—
2Proto-Slavicbèrzabirch
3Proto-Balto-Slavicberźas—
4Proto-Indo-EuropeanbʰerHǵosbirch

Words derived from “кладьнъ”

Every word from Proto-Indo-European bʰerHǵos →Every word from Proto-Balto-Slavic berźas →Every word from Proto-Slavic bèrza →