Name Explorer — Baby Names
Boy Names Starting with O
Looking for the perfect name? Browse boy names from real South African records, see how popular each one is, and how many people of every age share it.
Boy Names Starting with O — page 1 of 75
3,739 boy names
Sort: A–Z Most popular| Name | Boys | Surnames |
|---|---|---|
| O-Molemo Unisex | 2 | 5 |
| O'arabile Unisex | 1 | 6 |
| O'brain | 42 | 34 |
| O'brein | 23 | 21 |
| O'brey Unisex | 7 | 7 |
| O'brian | 166 | 143 |
| O'brien | 270 | 213 |
| O'bryan | 13 | 12 |
| O'callaghan Unisex | 16 | 17 |
| O'carroll Unisex | 4 | 3 |
| O'connel | 11 | 11 |
| O'connell Unisex | 31 | 29 |
| O'conner | 12 | 12 |
| O'connor Unisex | 77 | 63 |
| O'dean Unisex | 6 | 9 |
| O'dell Unisex | 3 | 6 |
| O'donnell | 21 | 16 |
| O'donoghue Unisex | 5 | 7 |
| O'donovan | 19 | 13 |
| O'fentse Unisex | 2 | 6 |
| O'flynn Unisex | 4 | 8 |
| O'grady Unisex | 10 | 13 |
| O'hagan Unisex | 7 | 7 |
| O'halloran Unisex | 7 | 3 |
| O'hara Unisex | 12 | 29 |
| O'jay | 12 | 13 |
| O'kelly Unisex | 8 | 7 |
| O'kennedy Unisex | 37 | 28 |
| O'leary Unisex | 7 | 8 |
| O'lerato Unisex | 3 | 8 |
| O'malley Unisex | 5 | 4 |
| O'mara Unisex | 27 | 17 |
| O'neal | 169 | 154 |
| O'neale Unisex | 10 | 13 |
| O'neall Unisex | 5 | 6 |
| O'neil | 337 | 271 |
| O'neill Unisex | 174 | 160 |
| O'nell Unisex | 4 | 5 |
| O'niel | 59 | 60 |
| O'niell | 11 | 12 |
| O'ratile Unisex | 4 | 8 |
| O'rayn | 14 | 15 |
| O'refile Unisex | 2 | 5 |
| O'regan | 6 | 6 |
| O'reilly Unisex | 41 | 38 |
| O'rien | 8 | 8 |
| O'riley | 5 | 5 |
| O'rourke Unisex | 4 | 5 |
| O'ryan | 178 | 165 |
| O'shaughnessy | 5 | 3 |
Our Baby Name Generator is based on our South African records, counting every first name a person has. Only real verified South African names are used with this tool. Due to privacy restrictions, records after 2010 are not included. * Updated 21 October 2026.