| Obadiah | | | Gender: | Male | | Origin: | Biblical |
| | | | | Biblical name of a minor prophet, meaning "servant of God". |
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| Obed | | | Gender: | Male | | Origin: | Biblical |
| | | | | Biblical name of the grandfather of David. The name is a form of Arabic Abd, meaning "servant of". |
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| Obi | | | Gender: | Male | | Origin: | African |
| | | | | African Igbo name meaning "heart". |
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| Obrad | | | Gender: | Male | | Origin: | Serbian |
| | | | | Serbian name meaning "happiness". |
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| Ocean | | | Gender: | Unisex | | Origin: | English |
| | | | | English unisex name derived from the vocabulary word, itself from Greek Okeanos, meaning "ocean". |
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