Old Norse eiðr

← Old English āþ (cognate)

← English oath (cognate)

← Proto-Germanic *aiþaz (inherited)

← Proto-Norse *ᚨᛁᚦᚨᛉ (inherited)

← Proto-Norse ᚨᛁᚦᚨᛚᚨᛏᚨᛉ (mention)

← Old High German eid (cognate)

← Gothic 𐌰𐌹𐌸𐍃 (cognate)

← Proto-Indo-European *h₁óytos (inherited)

← Old Frisian ēth (cognate)

← Old Saxon ēth (cognate)

→ Danish ed (inherited)

→ Faroese eiður (derived)

→ Old Swedish eþer (derived)

→ Old High German eid (cognate)

→ Icelandic eiður (derived)

→ Norwegian Bokmål ed (inherited)

→ Norwegian Nynorsk eid (inherited)

→ Old Norse trúnaðareiðr (compound)

→ Swedish ed (inherited)