Old Norse fjórir

← Proto-Germanic *fedwōr (inherited)

← Proto-Indo-European *kʷetwṓr (mention)

← Proto-Indo-European *kʷetwóres (derived)

→ Danish fire (inherited)

→ Faroese fýra (inherited)

→ Old Danish fyrætiughæ (derived)

→ Old Swedish fiurir (derived)

→ Old High German fior (cognate)

→ Icelandic fjórir (inherited)

→ Norwegian Bokmål fire (derived)

→ Norwegian Nynorsk fire (derived)

→ Norwegian Nynorsk fire (derived)

→ Old Norse fjórutigi (suffix)

→ Norn fyre (derived)

→ Elfdalian fyra (derived)

→ Swedish fyra (link)