The letter O stands out as one of the most distinctive, rounded, and expressive starting vowels for baby girls. From powerhouse global favorites like Olivia to lyrical vintage revivals like Ophelia, Olive, and Octavia, O names convey natural warmth, timeless poise, and artistic flair.
Whether you favor nature-inspired botanicals, strong mythological figures, or crisp contemporary options, this comprehensive directory gathers over 100 baby girl names starting with O along with their legitimate meanings.
For parents who love organic, botanical choices, Olive provides understated earthy charm, while literary revivals like Ophelia and Octavia carry dramatic grace and historical depth. If you prefer modern, tailored sounds, picks like Oakley or Oaklyn feel balanced and energetic. Browse the full collection below to find the perfect name for your little girl.
100+ Baby Girl Names That Start With O
| Name | Meaning |
| Olivia | Olive tree or peace |
| Olive | Olive tree symbol of peace |
| Ophelia | Help or aid |
| Oakley | Meadow of oak trees |
| Octavia | Eighth |
| Oaklyn | Oak tree lake |
| Opal | Precious jewel |
| Odette | Wealthy or fortune |
| Ona | Grace |
| Odelia | I will praise God |
| Oriana | Dawn or golden |
| Ocean | Large body of water |
| Olympia | From Mount Olympus |
| Oaklee | Oak meadow |
| Opaline | Precious stone |
| Oona | Lamb or unity |
| Ottilie | Prosperous in battle |
| Olena | Shining light |
| Orla | Golden princess |
| Oceana | Of the ocean |
| Oksana | Praise be to God |
| Olga | Holy or blessed |
| Orlaith | Golden princess |
| Ondine | Little wave |
| Ofelia | Helper |
| Odelina | Little wealthy one |
| Oline | Ancestor’s heir |
| Olyvia | Olive tree |
| Oprah | Fawn or gazelle |
| Oralia | Golden |
| Orabelle | Golden and beautiful |
| Orchid | Exotic flowering plant |
| Orenda | Spiritual energy |
| Orlena | Golden |
| Orva | Brave friend |
| Osanna | Deliver us |
| Ottilia | Fortunate battle |
| Ozara | Treasure |
| Oana | God is gracious |
| Obelia | Needle of stone |
| Ocarina | Musical vessel pipe |
| Ocie | Ocean |
| Odetta | Melodious wealth |
| Odila | Wealthy home |
| Odile | Fortune |
| Odilia | Prosperous |
| Oenone | Wine lady |
| Ohana | Family |
| Ovidia | Sheep shepherd |
| Oihana | From the forest |
| Oisina | Little deer |
| Okalani | Heavenly one |
| Olalla | Sweetly speaking |
| Olaya | Well-spoken |
| Oleandra | Evergreen shrub |
| Olearia | Daisy bush |
| Olenna | Bright light |
| Oleta | Winged or nimble |
| Olexa | Defender of humankind |
| Oliana | Oleander tree |
| Olimpia | Heavenly home of the gods |
| Olina | Joyous |
| Oliva | Olive branch |
| Olivette | Little olive |
| Olivine | Green gemstone |
| Olya | Holy |
| Olyssia | Noble |
| Oma | Commander or life |
| Omaira | Long life |
| Omana | Gentle woman |
| Omega | The end or greatest |
| Omnia | All or wishing |
| Ondina | Water spirit |
| Oneida | Standing stone |
| Onika | Warrior |
| Onora | Honor |
| Oola | Gem or jewel |
| Opalina | Shimmering jewel |
| Ophira | Land of gold |
| Ora | Light or prayer |
| Oralie | Golden |
| Ordell | Beginning |
| Oread | Mountain nymph |
| Orela | Divine announcement |
| Orena | Pine tree |
| Oria | Golden one |
| Orietta | Little golden one |
| Orina | Peace |
| Orit | Light |
| Orlaith | Golden ruler |
| Orly | Light unto me |
| Ornella | Flowing ash tree |
| Orpah | Fawn |
| Orquidea | Orchid blossom |
| Orsola | Little female bear |
| Ortrun | Secret of the point |
| Osla | Steep bank |
| Otelia | Wealthy homeland |
| Ovidia | Sheep herd |
| Ozma | Great ruler |
Curated Baby Girl Names Starting with O by Style
Popular O Names for Girls
- Olivia — Olive tree or peace
- Olive — Olive tree symbol of peace
- Ophelia — Help or aid
- Oakley — Meadow of oak trees
- Octavia — Eighth
Classic and Vintage O Names
- Opal — Precious jewel
- Odette — Wealthy or fortune
- Ottilie — Prosperous in battle
- Olga — Holy or blessed
- Ona — Grace
Unique O Names for Girls
- Oriana — Dawn or golden
- Orla — Golden princess
- Ondine — Little wave
- Ophira — Land of gold
- Ottilia — Fortunate battle
Short & Sweet O Names
- Ona — Grace
- Ora — Light or prayer
- Oona — Lamb or unity
- Orla — Golden princess
- Orly — Light unto me
How to Choose a Baby Name
- Vowel flow with the surname: Because O is a strong, rounded vowel, ensure the transition between the first name and last name doesn’t create a double-vowel stutter (e.g., “Olivia Owens”).
- Explore versatile diminutives: Traditional names like Octavia or Ottilie offer charming, relaxed nicknames such as Tavy, Otto, or Tillie.
- Verify monogram aesthetics: Audit your child’s initials to prevent accidental words or awkward monograms.
- Balance syllables: Pair a longer, multi-syllabic first name like Ophelia or Octavia with a concise one-syllable middle name (like Rose, Jane, or Mae) for great balance.
- Test everyday ease: Say the full name aloud in routine daily settings to make sure it feels natural and easy to articulate.
Frequently Asked Questions
What are the most popular baby girl names that start with O?
Olivia consistently ranks among the top names for girls nationwide, with Olive, Ophelia, and Oakley also holding high popularity.
What are rare or unique girl names beginning with O?
Distinctive O names with authentic roots include Oriana (Latin for “dawn”), Orla (Irish for “golden princess”), Ondine (Latin for “little wave”), and Ophira (Hebrew for “gold”).
What are good gemstone and nature O names?
Opal, Olive, Orchid, and Ocean provide timeless connections to precious stones, trees, flowers, and natural landscapes.
Are there good vintage O names making a revival?
Yes. Ophelia, Octavia, Opal, and Ottilie have seen strong revivals among parents seeking traditional names with storybook charm.
How do I break a tie between my favorite O names?
Write both options down on paper alongside your middle and last names, and try using each name in casual references over a few days to see which feels most like your child.