| Name | M/F | Meaning |
|---|---|---|
| Olaj | ![]() |
Meaning : Used in : Danish |
| Ondrej | ![]() |
Meaning : In Polish meaning is : Manly, Brave, Strong Used in : Australian, Czechoslovakian, Czech, German, Polish |
| Onosij | ![]() |
Meaning : Used in : Bengali |
| Onufrij | ![]() |
Meaning : Used in : Australian |
| Opraaj | ![]() |
Meaning : Lord's Kingdom. Used in : Sikh |