Proto-Indo-Iranian *Háywas

→ Avestan 𐬀𐬉𐬎𐬎𐬀 (inherited)

→ Central Kurdish یەک (derived)

→ Persian یک (inherited)

→ Persian ـی (inherited)

→ Finnish aivan (derived)

→ Northern Kurdish yek (derived)

→ Ossetian иу (derived)

→ Old Persian 𐎠𐎡𐎺 (inherited)

→ Sanskrit एव (inherited)

→ Bactrian ιωγο (derived)