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English firth
← Old English fyrhþe (inherited)
← Old English fyrhþ (mention)
← English fjord (doublet)
← English frith (link)
← English loch (link)
← English sea loch (link)
← English fyrth (link)
← Middle English fyrth (inherited)
← Middle English fyrth (inherited)
← Middle English frith (mention)
← Proto-Germanic *ferþu (derived)
← Proto-Germanic *ferþuz (mention)
← Proto-Germanic *furhiþją (inherited)
← Proto-Germanic *furhiþǭ (mention)
← Proto-Germanic *furhu (mention)
← Proto-Germanic *furahō (mention)
← Proto-Germanic *furhō (mention)
← Proto-West Germanic *furhiþi (inherited)
← Proto-Indo-European *per- (fare) (root)
← Proto-Indo-European *pértus (derived)
← Proto-Indo-European *per- (mention)
← Proto-Indo-European *-tus (mention)
← Proto-Indo-European *perkʷ- (root)
← Proto-Indo-European *pérkus (derived)
← Proto-Indo-European *perkʷ- (mention)
← Old Norse fjǫrðr (derived)
← Scots firth (borrowed)
← Scots furth (mention)

→ English loch (link)
→ English ford (doublet)
→ English fjord (doublet)
→ English frith (mention)
→ Old English fyrhþ (link)
→ Middle English frith (link)
→ Norwegian Nynorsk fjord (cognate)