| Olivia | olive tree |
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| Ollie | olive tree |
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| Oluwadamilola | the Lord has made me wealthy |
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| Olwen | white footprint |
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| Olympia | from Mount Olympus |
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| Omaira | long life; red |
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| Onneli | happiness; luck |
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| Onyx |
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| Oona | lamb |
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