Old Norse forn

← Old English firn (cognate)

← Old English fyrn- (mention)

← Proto-Germanic *fernaz (inherited)

← Old High German firni (cognate)

← Gothic 𐍆𐌰𐌹𐍂𐌽𐌴𐌹𐍃 (cognate)

← Proto-Indo-European *perHm- (inherited)

← Proto-Indo-European *perH- (mention)

← Proto-Indo-European *per- (derived)

← Old Frisian fīr (cognate)

← Old Frisian fēr (mention)

← Old Saxon fern (cognate)

→ English firn (cognate)

→ Old English fyrn (cognate)

→ Faroese fornur (inherited)

→ Westrobothnian frøn (cognate)

→ Old Swedish forn (inherited)

→ Icelandic forn (inherited)

→ Old Norse forðum (cognate)

→ Old Norse fornyrðislag (compound)

→ Swedish forn (inherited)