- Óður = Freyja's widely-travelled husband (SnE). Ode.
- Oddur = Point.
- Ófeigur = He who is not doomed to die.
- Ófnir = One of Óðinn's names. name of a serpent.
- Ófótan = One of Óðinn's names. Name of a giant.
- Ofsi = Passion, vehemence.
- Ómi = One of Óðinn's names.
- Ómur = One of Óðinn's names.
- Órator = Orator.
- Óri = Name of a dwarf.
- Ormur = Worm, serpent. Mn.
- Órnir = Name of a worm.
- Orri = OLd nick-name. Black grouse.
- Ósi = A horse named after a river mouth (Ós).
- Óskar = Mn. of Irish origin.
- Óspakur = Turbulent, restless. Mn.
- Otur = Otter.