This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “From áigi but what caused the vowel change?”
Koponen, Eino, Ruppel, Klaas, Aapala, Kirsti, editors (2002–2008), Álgu database: Etymological database of the Saami languages[1], Helsinki: Research Institute for the Languages of Finland