Proto-Slavic *o(b)

→ Bulgarian о (inherited)

→ Czech o (inherited)

→ Czech o- (inherited)

→ Old Church Slavonic о (inherited)

→ Old Church Slavonic о- (inherited)

→ Old Church Slavonic объ (inherited)

→ Lower Sorbian wob (inherited)

→ Lower Sorbian wó (inherited)

→ Lower Sorbian wobjed (mention)

→ Upper Sorbian wobjed (mention)

→ Polish o (inherited)

→ Polish o- (inherited)

→ Polish ob- (inherited)

→ Russian о (inherited)

→ Russian об (inherited)

→ Russian о- (inherited)

→ Russian обо (inherited)

→ Serbo-Croatian o (inherited)

→ Serbo-Croatian о (inherited)

→ Slovene o (inherited)

→ Ukrainian о (inherited)