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"O"
| Oakes | M | English |
| "near the oak trees" | ||
| Oakley | M | English |
| "oak tree meadow" | ||
| Oakley | M | English |
| "oak-tree meadow" | ||
| Oba | M | Egyptian |
| "king" | ||
| Oberon | M | German |
| "highborn and bearlike" | ||
| Obi | M | Hebrew |
| a familiar form of Obadiah - "servant of God" | ||
| Obie | M | Hebrew |
| a familiar form of Obadiah - "servant of God" | ||
| Oceana | M | Greek |
| "ocean" | ||
| Ocia | M | Greek |
| a short formof Oceana - "ocean" | ||
| Ocie | M | Greek |
| a short form of Oceana - "ocean" | ||
| Octavia | M | Latin |
| "eight" | ||
| Octavio | M | Latin |
| "eight child; eight" | ||
| Oda | M | Lakota |
| "friendly" | ||
| Odalis | M | Zuni |
| unknown | ||
| Odalys | M | Zuni |
| unknown | ||
| Oded | M | Hebrew |
| "encouraging" | ||
| Odele | M | Greek |
| "melody; song" | ||
| Odell | M | Greek |
| Grk: "ode, melody"; Irsh: "otter"; OE: "forested hill" | ||
| Odell | M | Greek |
| an alternate form of Odele -"melody; song" | ||
| Odessa | M | Greek |
| "odyssey; long voyage" | ||
| Odessey | M | Greek |
| an alternate form of Odessa - "odyssey; long voyage" | ||
| Odette | M | French |
| "wealthy" | ||
| Odie | M | Benin |
| "born along the road" | ||
| Odie | M | Benin |
| "born along the road" | ||
| Odilon | M | German |
| an alternate form of Otto - "rich" | ||
| Odin | M | Scandinavian |
| "ruler"; in Norse Mythology - the chief god | ||
| Odis | M | Greek |
| an alternate form of Otis - "keen of hearing" | ||
| Odysseus | M | Greek |
| "wrathful" | ||
| Ofelia | M | Greek |
| an alternate form of Ophelia - "useful; wise" | ||
| Ogden | M | English |
| "oak valley" | ||
| Okey | M | American |
| "from Oklahoma" | ||
| Oksana | M | Russian |
| "glory be to God" | ||
| Ola | M | Scandinavian |
| "ancestor" | ||
| Olaf | M | Scandinavian |
| "ancestor" | ||
| Olan | M | Scandinavian |
| a familiar form of Obadiah - "servant of God" | ||
| Olden | M | English |
| an alternate form of Alden - "old; wise protector" | ||
| Ole | M | Scandinavian |
| a familiar form of Obadiah - "servant of God" | ||
| Oleandra | M | Latin |
| "like a lioness" | ||
| Oleisa | M | Greek |
| an alternate form of Alexandria - "defender of mankind" | ||
| Olen | M | English |
| an alternate form of Olen -"holy" | ||
| Olene | M | Russian |
| an alternate form of Helen - "light" | ||
| Olery | M | Slavic |
| "ruler of all" | ||
| Oleta | M | Scandinavian |
| "nimble" | ||
| Olethea | M | Scandinavian |
| an alternate form of Oleta - "nimble" | ||
| Olga | M | Scandinavian |
| "holy" | ||
| Olia | M | Scandinavian |
| an alternate form of Olga - "holy" | ||
| Olin | M | English |
| "holy" | ||
| Olive | M | Latin |
| "olive tree; kind one" | ||
| Oliver | M | Latin |
| Ltn: "olive tree"; Scnd: "kind; affectionate" | ||
| Olivia | M | Latin |
| an alternate form of Olive -"olive tree; kind one" | ||