| Noya | Native Amer.. | "Sand." From the Cherokee.
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| Nuna | Native Amer.. | Meaning "land," it is the name of a.. | | |
| Nunna-Hidihi | Native Amer.. | Cherokee name derived from nungno h.. | | |
| Odakota | Native Amer.. | Derived from the Siouan dakdta (to .. | | |
| Odakotah | Native Amer.. | Meaning "friendship." Of Dakota or .. |  | |
| Odina | Native Amer.. | Mountain. Algonquian | | |
| Ogaki | Native Amer.. | Meaning "crow." From the Arapaho.
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| Ogaleesha | Native Amer.. | Red shirt. Sioux | | |
| Ogima | Native Amer.. | The Potawatomi word for "chief."
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| Ogimus | Native Amer.. | Meaning "little chief." From the Oi.. | | |
| Ogin | Native Amer.. | Meaning "wild rose." Source unknown.. | | |
| Ogleesha | Native Amer.. | Meaning "red shirt." From the Dakot.. | | |
| Ogow | Native Amer.. | Meaning "doe." From the Potawatomi... | | |
| Oh'to-Ah-Ne-So-To-Who | Native Amer.. | Seven bulls. Osage. The name was bo.. | | |
| Ohanko | Native Amer.. | Meaning "incautious." Source unknow.. | | |
| Ohanzee | Native Amer.. | Shadow. Sioux, | | |
| Oheo | Native Amer.. | Beautiful. Iroquois | | |
| Ohitekah | Native Amer.. | Brave. Sioux | | |
| Ohiyesa | Native Amer.. | Sioux name borne by Charles Alexand.. | | |
| Ojinjintka | Native Amer.. | Rose. Sioux | | |
| Okemos | Native Amer.. | Little chief. Ojibway | | |
| Okomi | Native Amer.. | An Arapaho name meaning "coyote."
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| Olamon | Native Amer.. | A Penobscot word of Maine meaning ".. | | |
| Olathe | Native Amer.. | Beautiful. Shawnee. The name was be.. | | |
| Olowin | Native Amer.. | Meaning "west." From the Miwok or M.. | | |
| Omemee | Native Amer.. | Pigeon, dove. Ojibway | | |
| Ominotago | Native Amer.. | Pleasant voice. Chippewa | | |
| Onacoma | Native Amer.. | Meaning "white owl," from the Chero.. | | |
| Onacona | Native Amer.. | White owl. Cherokee | | |
| Onaiwah | Native Amer.. | Awake. Ojibway | | |
| Onatah | Native Amer.. | Meaning "daughter of the earth and .. | | |
| Onean | Native Amer.. | "Yellow." From the Zuni.
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| Oneida | Native Amer.. | A tribal name that means "standing .. | | |
| Ongwaterohiathe | Native Amer.. | He lightens the sky for us. Iroquoi.. | | |
| Oniatario | Native Amer.. | Sparkling or beautiful water, fine .. | | |
