Proto-Slavic *želězo

→ Belarusian жалеза (inherited)

→ Bulgarian желязо (inherited)

→ Czech železo (inherited)

→ Old Church Slavonic желѣзо (inherited)

→ Lower Sorbian zelezo (inherited)

→ Ancient Greek χαλκός (cognate)

→ Upper Sorbian železo (inherited)

→ Macedonian железо (inherited)

→ Old East Slavic желѣзо (inherited)

→ Polish żelazo (inherited)

→ Old Prussian gelso (cognate)

→ Russian железо (inherited)

→ Serbo-Croatian железо (inherited)

→ Serbo-Croatian жељезо (inherited)

→ Serbo-Croatian železo (inherited)

→ Serbo-Croatian željezo (inherited)

→ Slovak železo (inherited)

→ Slovene železo (inherited)

→ Ukrainian залізо (inherited)

→ Old Czech železo (inherited)