From Wiktionary, the free dictionary
From Old Norse einu, neuter dative singular of einn.
eino
- An old dative form of ein, used in fixed expressions such as i eino or på eino.
- “eino” in The Nynorsk Dictionary.
From ein (“one”) + -o.
eino
- alone
- Köbler, Gerhard, Althochdeutsches Wörterbuch, (6. Auflage) 2014