Proto-Slavic *běsъ

→ Belarusian бес (inherited)

→ Bulgarian бяс (inherited)

→ Czech běs (inherited)

→ Kashubian biés (inherited)

→ Old Church Slavonic бѣсъ (inherited)

→ Old Church Slavonic бѣсъ (inherited(cu/orv))

→ Lithuanian baisus (cognate)

→ Macedonian бес (inherited)

→ Polish bies (inherited)

→ Polish Bis (mention)

→ Russian бес (inherited)

→ Serbo-Croatian bes (inherited)

→ Serbo-Croatian бес (inherited)

→ Serbo-Croatian bijes (inherited)

→ Serbo-Croatian бијес (inherited)

→ Ukrainian біс (inherited)