Where does “багъно” come from?

багъно (Old East Slavic) comes from Proto-Slavic bagno, from Proto-Slavic bagati — to ignite fire.

Ancestry of “багъно”, step by step

StepLanguageWordMeaning
1Proto-Slavicbagnomarsh
2Proto-Slavicbagatito ignite fire
Every word from Proto-Slavic bagati →Every word from Proto-Slavic bagno →