Obed- Ocean
- Octavia
- Octavie
- Octavius
- October
- Oddo
- Odessa
- Odette
- Odoacer
- Odoacre
- Odovacar
- Odysseus
- Oedipus
- Oenone
- Ofelia
- Ogneslava
- Oidipous
- Oinone
- Olindo
- Oliva
- Olive
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- Olivia
- Oliviero
- Olympia
- Olympian
- Olympiodoros
- Omar
- Omiros
- Onder
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- Onesimus
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- Onesiphorus
- Onnophris
- Onofrio
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- Onuphrius
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- Ophiuchus
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- Orazio
- Orest
- Oreste
- Orestes
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Genger
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The first letter
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