| Odubel | O'Dubel is an Irish surname meaning 'descendant of Dubhghaill,' meaning 'dark stranger' or 'dark foreigner'. |
| Og | A cake bread baked in ashes |
| Ogen | It means a gift from heaven. |
| Ohab | It means a beloved person. |
| Ohaba | It means a joyful greeting. |
| Ohage | Ohage is a Japanese surname meaning 'great rice field' or 'large paddy field'. |
| Ohitika | Ohitika is a Maori name meaning 'to be in a state of being free from care or worry'. |
| Oiley | Derived from oil, meaning smooth. |
| Oisyn | A name meaning a small deer fawn. |
| Okendra | A name meaning a powerful ruler. |
| Okey | Derived from the Choctaw Native American word 'okeh,' meaning 'it is so' or 'agreement.' |
| Olajuwan | Olajuwan means 'God is my strength' or 'God is my protector' in Yoruba language. |
| Olan | Derived from Gaelic, 'Olan' means 'descendant of the champion' or 'strong and powerful'. |
| Olavi | Ancestors descendant or heir |
| Olavo | A noble and ancestral legacy |
| Olbracht | A bright and noble heritage |
| Oldrich | A ruler of noble heritage |
| Oldrik | Powerful inheritance |
| Olee | The remaining of the ancestors |
| Olek | Defender of man |
| Oleksandr | Defender; helper of mankind |
| Olev | A survivor of noble descent |
| Olia | Highest; loftiest; upmost |
| Olirmeni | I couldn't find any information on the name 'Olirmeni'. |
| Olivio | An olive tree of peace |
| Olivor | An ancestor of the olive |
| Oluf | A descendant or ancestor. |
| Olufunke | God took care of |
| Omen | A sign of a future occurrence. |
| Omero | Security;pledge |
| Ometz | Courage or strength of heart. |
| Omir | A longlived or noble leader. |
| Omkumar | A son of the divine Om sound. |
| Omnada | Omnada is a Latin-derived name meaning 'all-giving' or 'all-powerful', often associated with divine or omnipotent qualities. |
| Ompratap | The glory of the divine Om. |
| Ondrej | A name meaning manly and brave. |
| ONeill | Descendant of Eoghan, a name of Irish origin meaning 'born of the yew tree' or 'descendant of Eoghan'. |
| Onyeka | God is the greatest |
| Onyekachi | God is the greatest |
| Oojitv | A person who is strong and mighty. |