Name	Meaning	Gender	Origin	Similar
Obiareus	A Titan.	Male	Greek	-
Oceana	Form of Oceanus. In Greek mythology Oceanus was a Titan father of rivers and water nymphs.	Female	Greek	-
Oceanus	Father of the Oceanids.	Male	Greek	-
Ocnus	Incompetent.	Male	Greek	-
Ocypete	A Harpy.	Female	Greek	-
Odele	Harmonious.	Female	Greek	-
Odelet	Little singer.	Female	Greek	-
Odelette	Little singer.	Female	Greek	-
Odelle	Harmonious.	Female	Greek	-
Odessa	odyssey, journey, voyage	Female	Greek	-
Odysseia	Wrathful.	Female	Greek	-
Odysseus	full of wrath	Male	Greek	-
Oedipus	Swollen foot.	Male	Greek	-
Oeneus	King of Calydon.	Male	Greek	-
Oenomaus	Son of Ares.	Male	Greek	-
Oenone	Lover of Paris.	Female	Greek	-
Oighrig	Well spoken.	Female	Greek	-

Oighrig	Well spoken.	Male	Greek	-
Oleisia	Protector of man.	Female	Greek	-
Olena	Light.	Female	Greek	-
Oles	Defender of man.	Male	Greek	-
Olexa	Defender of mankind. Feminine of Alexander.	Female	Greek	-
Olina	Light.	Female	Greek	-
Olympe	From Olympus.	Female	Greek	-
Olympia	of Mount Olympus, heavenly	Female	Greek	Olympe, Olimpie
Omega	great	Female	Greek	-
Omphale	A queen of Lydia.	Female	Greek	-
Onella	Light.	Female	Greek	-
Ophelia	useful, wise	Female	Greek	Ofelia, Ofilia, Ophelie, Phelia
Ophelie	Wisdom.	Female	Greek	-
Ophion	A serpent.	Male	Greek	-
Ophira	gold	Female	Greek	Oprah
Orea	From the mountain.	Female	Greek	-

Oreias	From the mountain.	Male	Greek	-
Oreste	From the mountain.	Male	Greek	-
Orestes	From the mountain.	Male	Greek	-
Oria	From the mountain.	Female	Greek	-
Orion	Rising in the sky; dawning. Mythological Orion was a mighty hunter and son of Poseidon. The constellation Orion contains three conspicuous stars.	Male	Greek	-
Orpheus	Son of Apollo.	Male	Greek	-
Orrin	mountain	Male	Greek	Orestes, Orest
Orthros	Guardian of Geryon.	Male	Greek	-
Ortygia	Calypso's island.	Female	Greek	-
Otis	Keen of hearing.	Male	Greek	-
Otos	Keen of hearing.	Male	Greek	-
Otus	Keen of hearing.	Male	Greek	-
Owain	Variant of Eugene: Well-born. Famous bearer: Prince Eugene of Savoy; American playwright Eugene O'Neill.	Male	Greek	-
Owen	Variant of Eugene: Well-born. Famous bearer: Prince Eugene of Savoy.	Male	Greek	-
Page	Child.	Female	Greek	-
Palaemon	A sea god.	Male	Greek	-

Palamedes	Son of Nauplius.	Male	Greek	-
Pamela	honeyed	Female	Greek	Pamyla, Pamilla, Pamella, Pamelia, Pamelyn, Pamelina, Pammy, Pammie, Pam
Pan	God of flocks.	Male	Greek	-
Panagiota	Holy.	Female	Greek	-
Panagiotis	All or holy.	Male	Greek	-
Pancratius	Supreme ruler.	Male	Greek	-
Pandareos	A thief.	Male	Greek	-
Pandarus	Killed for breaking a truce.	Male	Greek	-
Pandora	talented one	Female	Greek	Pan, Dora, Dory, Dorothy, Theodore, Theodora, Endora, Dorothea
Panos	a rock	Male	Greek	-
Panphila	All loving.	Female	Greek	-
Pansy	Flower.	Female	Greek	-
Panteleimon	Merciful.	Male	Greek	-
Panthea	All the gods.	Female	Greek	-
Panthea	of all the Gods	Male	Greek	-