Obedientia (Italian): “Obedient.”
Öborg (Swedish): Derived from Ancient Scandinavian name Øyborg, from Old Norse roots ey (“island” or “good fortune”) and borg (castle).
Odelina (English): Nickname for a feminine form of Otto (fortune, wealth), such as Odilie, Odil, or Oda.
Odfrida (English): Feminine form of Ancient Germanic name Autfrid, from Ancient Germanic root auda (property, wealth) and Old High German root fridu (peace).
Olisava (Polish, Slavic)
Ombeline (French): Feminine form of Humbelin, a Medieval nickname for Humbert (bright warrior). Its Ancient Germanic roots are hun (bear cub, warrior) and beraht (bright).
Oneka (Basque): Feminine form of Eneko, from possible roots ene (my) and ko (diminutive suffix).
Onesta (Italian): Either from noun onestà (honesty) or adjective onesta (sincere, honest). The masculine form was Onesto.
Opportuna (French): From Latin root opportunus (favourable, useful, suitable).
Orabile (Italian): From Latin root orabilis (invokable).
Orbita, Auribita (Basque): Possibly derived from Auria (golden) and Bita.
Orelia (Tuscan and Venetian Italian): Form of Aurelia, from Latin root aureus (gilded, golden).
Orienta (French): From Latin root oriens (east, rising, sunrise, daybreak, dawn).
Orraca (Portuguese): Form of Spanish and Basque name Urraca, from Spanish word urraca (magpie), and Latin root furax (thievish).
Orsa (Italian): “Bear,” from Latin root ursus.
Orta (Basque): Possibly a feminine form of Orti, and thus a form of Fortuna. A more elaborated form was Ortissa.
Osaba (Basque): “Uncle.”
Osana (Basque): Possibly derived from root otzan (tame) or otso (wolf).
Osterlind (German): From Ancient Germanic roots austra (east) and lind (lime, linden tree, lime wood shield; soft, gentle).
Odder (Swedish): Derived from Old Norse name Oddr (point of a sword).
Oddolf, Oddulf (Swedish): Derived from Old Norse name Uddulfr, with roots oddr and ulfr (wolf).
Odinkar (Swedish): Derived from Old Norse name Óðinkárr, either from Old Danish root othankar/othinkar (raging, easily furious), or Old Norse roots óðr (rage, frenzy, inspiration) and kárr (“curly-haired” or “obstinate; reluctant”).
Ödmar (Swedish): Derived from Ancient Germanic name Audamar, from roots aud (fortune, wealth) and meri (famous).
Olivar (Catalan): Probably a form of Oliver.
Ølvir (Danish), Ølver (Swedish): Derived from Old Norse name Ǫlvér/Alvér, which in turn descends from Aluwīhaz. Its possible roots are allr (entire, all) or aluh (temple), and vér (fighter).
Omobono (Italian): Po Valley dialect for “good man.” This is the name of the patron saint of Cremona, Italy; shoemakers; tailors; and businesspeople. He devoted his life to peacemaking and charity.
Ordoño (Spanish): Possibly derived from Latin root fortunius (fortunate).
Ordulf (German): From Ancient Germanic roots ort (point) and wulf (wolf).
Orendel (Middle High German): Form of Old Norse name Aurvandill, via Old High German Orendil/Orentil. It either means “morning star, morning, beam,” or derives from roots aur (water) andd vandill (sword). Prince Orendel of Trier is the title hero of a 12th century German epic poem.
Orm (English, Danish, Swedish): Derived from Old Norse name Ormr (serpent, snake).
Ormsten (Swedish): Derived from Old Norse name Ormsteinn, from roots ormr and steinn (stone).