Boy Baby Names - O
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| NAME | ORIGIN | MEANING |
| Okhmhaka | Native American | Little wolf (Cheyenne). |
| Okpara | Egyptian | First born. |
| Ol | Welsh | Legendary son of Olwydd. |
| Olaf | Old Norse | talisman, ancestor |
| Olav | Norse | Variant of Olaf: Relic; ancestral heritage. |
| Olave | Norse | Variant of Olaf: Relic; ancestral heritage. |
| Oldrich | Czech | one with riches and power |
| Ole | Danish | Family. |
| Oleg | Slavic | one who is holy |
| Oleif | Norse | Relic descendant. |
| Olen | Norse | Relic. |
| Oleos | Spanish | holy oil used in church |
| Oles | Greek | Defender of man. |
| Olezka | Russian | Holy. |
| Olin | Old-English | holly |
| Oliphant | Scottish | Great strength. |
| Oliver | Old Norse, Latin, Old French | kind one; olive tree, peace |
| Oliverio | Latin | Peaceful. |
| Oliverios | Latin | Peaceful. |
| Olivier | French | From the olive tree. |
| Ollaneg | English | From Olney. |
| Ollie | Greek | From the name OLIVER |
| Olliver | Latin | Peaceful. |
| Olney | English | From Olney. |
| Olof | Norse | Relic. |
| Olvaerr | Norse | Affectionate. |
| Olvan | Latin | Peaceful. |
| Olvir | Norse | Affectionate. |
| Olwydd | Welsh | Tracker. |
| Olyn | Norse | Relic. |
