←
Proto-Germanic *aiz (inherited)
←
Proto-Indo-European *h₂éyos (inherited)
→
Old English ar (cognate)
→
Faroese Eir (inherited)
→
Old High German er (cognate)
→
Old High German era (cognate)
→
Icelandic eir (inherited)
→
Norwegian Nynorsk eir (inherited)
→
Old Saxon era (cognate)