Proto-Slavic *kъňiga

→ Belarusian кніга (inherited)

→ Bulgarian книга (inherited)

→ Czech kniha (inherited)

→ Kashubian knéga (inherited)

→ Kashubian knéżka (derived)

→ Kashubian knëga (inherited)

→ Old Church Slavonic кънига (inherited)

→ Old Church Slavonic кънигꙑ (inherited)

→ Lower Sorbian knigła (inherited)

→ Upper Sorbian kniha (inherited)

→ Hungarian könyv (cognate)

→ Lithuanian knyga (derived)

→ Macedonian книга (inherited)

→ Old East Slavic кънига (inherited)

→ Polish księga (inherited)

→ Russian книга (inherited)

→ Yakut кинигэ (cognate)

→ Serbo-Croatian књига (inherited)

→ Serbo-Croatian knjiga (inherited)

→ Slovak kniha (inherited)

→ Slovene knjiga (inherited)

→ Ukrainian книга (inherited)

→ Old Czech kniha (inherited)

→ Slovincian knega (inherited)