| Name | Gender | Origin | Meaning | Syllables | Pronunciation | Related name | Related opposite sex | International names | Rated |
|---|---|---|---|---|---|---|---|---|---|
| Oakley | boy | English | Oakley is a traditionally an old English name and relates to the tree of the same name, and means 'from the oak', or 'oak meadow'. | 2 | OAK-lee | ||||
| Ocean | unisex | English | Very rarely used in today's society. Taken form the literal translation to mean a large body of water. | 2 | O-shan | Oceana, | |||
| Octavia | girl | Latin | Octavia is the feminine version of the name Octavious. It means 'eighth', refering to the month. This was the original surname of the emporer Augustus and the reason we refer to the eigth month as August. | 4 | aak-TEY-viy-ah | Octivia | Octavious, Ottavio | Oktawja; Ottavia; Octavie | - |
| Odhran | boy | Irish | Odhran has an Irish meaning of 'pale green'. It was the name of a Saint. | 2 | OH-rawn | Odran, Orrin, Darren | Otterino | ||
| Odin | boy | Norse | The name Odin is particularly popular within Scandinavia and means 'fury' and 'inspiration'. Odin is also the name of the highest God in Norse mythology, and presided over art, wisdom, war, death, poetry and magic. | 2 | O-din | Oddone; | - | ||
| Oisin | boy | Celtic | Oisin is largely used in the English language, from Celtic origin meaning 'little deer' | 2 | OSH-een | Oswin, Aseem | Oksana, Osanna | Ahkeen; Hakim | |
| Ola | girl | Norse | From the Old Norse word 'ala' meaning 'nourisher, protector' someone experienced and skilled. | 2 | O-la | Ollie, Olivia | Oliver, Ollie | Alivia | - |
| Olaf | boy | Norse | Meaning 'ancestor's decendant', the name Olaf is especially popular in Scandinavia with many Kings and Saints bearing this name. As a result, children have been given this name in honour of such figures. | 2 | O-lahf | Olin, | Ola; Olafur; Olav; Oluf; Olavi; Ole; | - | |
| Olga | girl | Norse | Mainly used in Russian, Scaandinavian and Slavic countries, the name Olga is known to mean 'holy' amd 'blessed'. | 2 | OL-gah | Helga, | Oleg, | ||
| Oli | boy | German | Derived from Germanic origin meaning 'elf warrior'or from the Laton for 'olive tree', a variation of Oliver. | 2 | OL-ee | Oliver, Ollie | Olivia, Lily | Ole; Oalo; Olo | - |
| Oliva | girl | Latin | From the Latin name for the olive tree. A variant of the name Olivia. May also derive from the Germanic for 'elf warrior'. | 3 | OHHLIVah | Olive, Olivia, Livia | Oliver | ||
| Olive | unisex | Latin | Derived from Latin language, meaning 'olive tree'. A dimunative of the name Livia and a feminine version of the name Oliver. | 2 | AALahV | Olivia, Livia, Olive | Oliver | Alva | - |
| Oliver | boy | German | The meaning of the name is 'elf warrior' meaning supernatural being. The English version of the name means olive tree and symbolizes dignity, peace and fruitfulness. | 3 | AALahVer | Olly | Olivia | Olivier; Oliviero; Olghar; Havelock | |
| Olivia | girl | Latin | From the Latin word for olive. Symbolising peace and fruitfulness. Was first used in this form by William Shakespeare. | 4 | OLIVeeA | Oliva, Livia, Elivina | Oliver | Olaf; Olave; Olavi; | |
| Olivier | boy | German | This is the French version of the Germanic name Oliver, meaning "elf warrior" or "olive tree". | 3 | ol-ee-VYAY | Oliver, Olaf | Olivia, Olive | Olavi; Olov | - |
| Oliwer | boy | German | Varient of the name Oliver meaning 'elf warrior; olive tree'. | 3 | OL-ee-wer | Oliver, Ollie | Olivia, Ollie | Olivero; Olivier | - |
| Oliwia | girl | Latin | From the Latin for 'Olive tree', Oliwia is a variant of the English 'Olivia' used in Hawaiin | 4 | ahLAYViyah | Olivia, Alba, Alivia, | Oliwer | Alvah; Alvie | - |
| Oliwier | boy | Latin | From the Latin for 'Olive tree', Oliwier is a variant of the English 'Oliver' used in Hawaiin | 4 | ahLAYViyah | Olivia, Alba, Alivia, | Oliwia | Alvah; Alvie | - |
| Ollie | boy | German, Latin | From the Latin name Olive, refering to the olive tree, also means 'elf warrior' or 'elf army'. | 2 | AALiy or OWLiy | Olive, Oliver | Olivia, Livia | ||
| Olly | boy | German | Meaning 'elf warrior' or 'olive tree', it is related to Oliver of English and German origins. It is used largely in the English language. | 2 | AALiy | Ollie, Olli, Ol, Oliver, Olli, Olley | Ollie, Olivia, Ola, Aaliyah, Alja, Alisa | Ulli; Aleix; Alejo; Ella; Alaois; Ayal |