Proto-Germanic *ēdrǭ

→ Cimbrian aadar (inherited)

→ Finnish Eura (borrowed)

→ Faroese æðr (inherited)

→ Faroese æður (derived)

→ Irish éadar (derived)

→ Icelandic æður (derived)

→ German Low German Åder (inherited)

→ Old Norse æðr (inherited)

→ Yiddish אָדער (inherited)