Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 121 | Oleif | Norse | Relic descendant. | M | |
| 122 | Olen | Norse | Relic. | M | |
| 123 | OLes | Polish | Polish form of Alexander 'defends mankind'. | M | |
| 124 | Oles | Greek | Defender of man. | M | |
| 125 | Olezka | Russian | Holy. | M | |
| 126 | Olin | Norse | Relic. | M | |
| 127 | Oliphant | Scottish | Great strength. | M | |
| 128 | Oliver | English | The olive tree. The biblical olive tree symbolizes fruitfulness and beauty and dignity. 'Extending an olive branch' signifies an offer of peace. | M | |
| 129 | Oliver | French | The olive tree. The biblical olive tree symbolizes fruitfulness and beauty and dignity. Extending an olive branch signifies an offer of peace. | M | |
| 130 | Oliver | German | Elf army. Can also be a variant of Olaf: Relic, ancestral heritage. | M | |
| 131 | Oliver | Latin | Olive (symbol of peace); peaceful. | M | |
| 132 | Oliver | Norse | Affectionate. | M | |
| 133 | Oliver | Shakespearean | As You Like It' Son of Sir Rowland de Boys. As You Like It' Sir Oliver Martext, a vicar. | M | |
| 134 | Oliverio | Latin | Peaceful. | M | |
| 135 | Oliverio | Spanish | Affectionate. | M | |
| 136 | Oliverios | Latin | Peaceful. | M | |
| 137 | Oliverios | Spanish | Affectionate. | M | |
| 138 | Olivier | French | From the olive tree. | M | |
| 139 | Olivier | German | Variant of Oliver: Elf army. Can also be a variant of Olaf: Relic, ancestral heritage. | M | |
| 140 | Olivier | Latin | Variant of Oliver: Olive (symbol of peace); peaceful. | M | |