Proto-Slavic *kľučь

→ Belarusian ключ (inherited)

→ Bulgarian ключ (inherited)

→ Czech klíč (inherited)

→ Kashubian klucz (inherited)

→ Old Church Slavonic ключь (inherited)

→ Lower Sorbian kluc (inherited)

→ Upper Sorbian kluč (inherited)

→ Hungarian kulcs (derived)

→ Hungarian kulcsár (derived)

→ Macedonian клуч (inherited)

→ Polish klucz (inherited)

→ Polabian kľauc (inherited)

→ Romanian clucer (derived)

→ Russian ключ (inherited)

→ Serbo-Croatian кључ (inherited)

→ Serbo-Croatian ključ (inherited)

→ Slovak kľúč (inherited)

→ Slovene ključ (inherited)

→ Albanian kyç (derived)

→ Ukrainian ключ (inherited)