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Oakes (either) English
Oakley (boy) Traditional
Oberon (either) German
Obert (boy) French
Obie (boy) Traditional
Ocean (either) Greek
Ocie (either) Traditional
Octave (boy) Traditional
Octavian (boy) Latin
Octavio (boy) Traditional
Octavious (boy) Latin
Octavius (boy) Greek
October (either) American
Odakota (boy) Amerindian
Oded (boy) Hebrew
Odell (either) Traditional
Odie (either) Traditional
Odin (either) Scandinavian
Odis (boy) Traditional
Odysseus (boy) Greek
Ogden (boy) English
Ogen (boy) Hebrew
Ohanzee (boy) Amerindian
Oistin (boy) Irish
Ojai (either) Spanish