| Occa | One who brings peace and order. |
| Oceania | Loves the Ocean |
| Ocilia | A person with keen, sharp vision. |
| Ockvilly | A dweller of the rocky meadow. |
| Odierna | One who lives for the day ahead. |
| Odierne | A name meaning wealthy or rich. |
| Odine | Derived from the word for valley. |
| Odolina | A name meaning wealthy protector. |
| Offede | A name meaning peace or harmony. |
| Ofilia | A name meaning helpful or useful. |
| Ofri | A name meaning my fruit or yield. |
| Ohda | Responsibility, Trusteeship |
| Ohi | A name meaning to be very joyful. |
| Ohileshwari | A name meaning goddess of joy. |
| Ohto | A name meaning a bear or strength. |
| Oiddii | A name meaning a small treasure. |
| Oilie | A variant of Olive, meaning peace. |
| Oisha | Derived from Sanskrit, meaning life. |
| Oishiki | A unique name meaning divine light. |
| Oishini | Goddess Lakshmi |
| Oishree | A name meaning beautiful goddess. |
| Oissine | Derived from Gaelic, meaning fawn. |
| Oivi | A Finnish name meaning a gift. |
| Oivikki | A name meaning a precious gift. |
| Oixie | The Power of Love |
| Ojaala | A name meaning a ray of light. |
| Ojashvi | Bright, Glow, Vitality |
| Ojashvii | A name meaning bright and bold. |
| Ojashvini | Bright, Splendid, Full of Light |
| Ojashwee | Bright, Splendid, Energetic |
| Ojayita | One who Behaves Courageously |
| Ojeswi | Shining, Bright, Full of Light |
| Ojvi | A short name meaning full of life. |
| Okindu | A name of African origin meaning sun. |
| Okitha | A name meaning a bright, shining star. |
| Okithma | A name meaning one who is very wise. |
| Oksenja | A name meaning a hospitable person. |
| Ol | Legendary son of olwydd |
| Olajuwon | A name meaning honor is wealth to me. |
| Olamilekan | My wealth is growing |