Old English fyrhþ

← Old English fyrhþe (link)

← English firth (link)

← Middle English firth (link)

← Proto-Germanic *furhō (derived)

← Proto-Germanic *furahō (mention)

← Proto-Germanic *furhō (derived)

← Proto-Germanic *furahō (mention)

← Proto-West Germanic *furhiþ (inherited)

← Proto-West Germanic *furhiþi (inherited)

← Proto-Indo-European *perkos (derived)

← Proto-Indo-European *perkos (derived)

← Scots fyrth (link)

→ English forest (cognate)

→ English firth (mention)

→ English frith (mention)

→ Middle English frith (mention)

→ Old Norse fýri (cognate)