| Ogima | Native Amer.. | The Potawatomi word for "chief."
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| Ogimus | Native Amer.. | Meaning "little chief." From the Oi.. |  | |
| Ogleesha | Native Amer.. | Meaning "red shirt." From the Dakot.. | | |
| Ogun | Nigerian | Meaning "God of war." | | |
| Oh'to-Ah-.. | Native Amer.. | Seven bulls. Osage. The name was bo.. | | |
| Ohanko | Native Amer.. | Meaning "incautious." Source unknow.. | | |
| Ohanzee | Native Amer.. | Shadow. Sioux, | | |
| Ohitekah | Native Amer.. | Brave. Sioux | | |
| Ohiyesa | Native Amer.. | Sioux name borne by Charles Alexand.. | | |
| Ohm | African | Meaning "chief." | | |
| Oilbhries | Scottish | Gaelic form of Oliver, a name of de.. | | |
| Oisin | Irish | Diminutive form of os (a deer): hen.. | | |
| Ojo | Nigerian | Meaning "a difficult birth."
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| Ojore | African | A man of war, soldier. Ateso, Ugand.. | | |
| Ojore | Ugandan | Meaning "a warrior."
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| Okechuku | African | A gift of God. Ibo, Nigeria | | |
| Okello | African | Born after twins. Ateso, Uganda | | |
| Okemos | Native Amer.. | Little chief. Ojibway | | |
| Okie | American | "From Oklahoma." | | |
| Oko | Ghanaian | Meaning "the elder of twins." | | |
| Okomi | Native Amer.. | An Arapaho name meaning "coyote."
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| Okot | Ugandan | Meaning "born when it is raining." .. | | |
| Okoth | Kenyan | Meaning "born when it is raining." .. | | |
| Okpara | African | First-born son. Ibo, Nigeria | | |
| Okpara | Nigerian | A name that means "the first son."
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| Oktawjan | Polish | Polish cognate of the Latin Octaviu.. | | |
| Ola | Nigerian | Meaning "wealthy, rich."
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| Oladele | African | Oriki name meaning "we are honored .. | | |
| Olaf | Polish | A borrowing from the Scandinavians,.. | | |
| Olaf | Scandinavia.. | Derived from the Old Norse Anlaff (.. | | |
| Olaf | Norwegian | Meaning "ancestor." A patron saint .. | | |
| Olafemi | African | Honor favors me, fortunate. Yoruba,.. | | |
| Olajuwon | Nigerian | Meaning "wealth and honor are God's.. | | |
| Olakeakua | Hawaiian | Compound name composed of the eleme.. | | |
| Olamina | Nigerian | Meaning "my riches."
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