Proto-Indo-European *h₃ebʰi

→ Bulgarian о (inherited)

→ Czech o (derived)

→ Czech o- (derived)

→ Czech ob- (derived)

→ Old Church Slavonic о (derived)

→ Old Church Slavonic объ (derived)

→ Lower Sorbian wobjed (derived)

→ Lower Sorbian wobjed (derived(dsb/hsb))

→ Polish o (inherited)

→ Polish o- (derived)

→ Polish ob- (derived)

→ Russian о (inherited)

→ Russian об (inherited)

→ Russian о- (derived)

→ Russian обо (inherited)

→ Serbo-Croatian o (derived)

→ Serbo-Croatian о (derived)

→ Serbo-Croatian ob- (derived)

→ Serbo-Croatian об- (derived)

→ Slovene o (derived)

→ Ukrainian о (inherited)