| Obdulia | f | Arabic | The name Obdulia is derived from Abdulia and is the feminine form of the name Abdul |
| Octavia | f | Latin | Octavia is a feminine derivative of the name Octavianus, which has its origin in the Ro… |
| Octavia-Marisol | f | Latin | Octavia means 'the eighth' |
| Oiartza | f | Basque | Oiartza is a Basque girl's name that comes from the Spanish-speaking area |
| Oihan | m | Basque | Oihan, a male first name, is translated from Basque as "the forest." It is relatively c… |
| Oihana | f | Basque | The name Oihana is the feminine variant of Oihan and carries the meaning 'the forest' |
| Olah | f | Norse | Olah can be seen as a variant of Ola, which is a feminine derivation of the name Olaf, … |
| Olalla | f | Spanish | Olalla is a Spanish variant of Eulalia |
| Olegario | m | Portuguese | The name originates from Portuguese and Spanish |
| Olgenia | f | Slavic | The exact origin of the name Olgenia is unclear |
| Olinda | f | Spanish | Olinda is a female first name that originates from South America and is likely a varian… |
| Oliva | f | Latin | Oliva is a first name that has Italian and Spanish roots and is considered a form of Ol… |
| Olivia-Fleur | f | Latin | Olivia represents the olive tree in Latin, a symbol of peace and life |
| Olivia-Marie | f | Aramaic | Olivia-Marie is a double name combining Olivia ("the olive") and Marie ("the beloved") |
| Oliviana | f | Latin | The name Oliviana is a feminine form and traces back to Olivia, with origins in Oliva |
| Olmo | m | Italian | Olmo literally translates from Italian and Spanish to 'the elm.' The first name is main… |
| Omri | m | Hebrew | Omri is a biblical name for boys, the origin of which is uncertain |
| Orelia | f | Latin | Orelia represents an old Italian, Tuscan, and Venetian variant of Aurelia, which goes b… |
| Orella | f | Latin | Orella is considered a Basque form of Aurelia |
| Orfeo | m | Italian | Orfeo is the Italian and Spanish form of the name Orpheus |
| Orinda | f | | The name Orinda is a rare English name for girls and means 'the Golden One' or 'the Gol… |
| Orlinda | f | Italian | The name Orlinda is regarded as the feminine form of Olynthus, which has its origin in … |
| Oroitz | m | Basque | The first name Oroitz has its roots in the Basque word oroit, which means 'the memory' |
| Osane | f | Basque | Osane is translated as 'the Healer' |
| Ovidio | m | Latin | Ovidio, a male first name, is the Italian and Spanish form of the name Ovidius, which o… |