| Name | Meaning | Gender | Origin | Rashi |
|---|---|---|---|---|
| Önder | Leader | 👦 Boy | Turkish | — |
| Ondra | Strong; Manly (Ondřej) | 👦 Boy | Czech | — |
| Ondřej | Manly (Andrew) | 👦 Boy | Czech | — |
| Oneida | Long-awaited | 👧 Girl | Spanish | — |
| Öner | Proposes; Leader | 👦 Boy | Turkish | — |
| Onkar | The sacred sound Om | 👦 Boy | Sanskrit | Vrishabh |
| Onke | All; Everyone | 👦 Boy | Xhosa | — |
| Onni | Luck; Happiness | 👦 Boy | Finnish | — |
| Onno | Grace | 👦 Boy | Dutch | — |
| Onofrio | Always happy | 👦 Boy | Italian | — |
| Ons | Intimacy; Companionship | 👧 Girl | Arabic | — |
| Onur | Honour; Pride | 👦 Boy | Turkish | — |
| Onurcan | Honourable soul | 👦 Boy | Turkish | — |
| Onyango | Born late in the morning | 👦 Boy | Luo | — |
| Onyebuchi | Who is God? | 👦 Boy | Igbo | — |
| Onyeka | Who is greater than God? | 👦 Boy | Igbo | — |
| Onyekachi | Who is greater than God? | 👦 Boy | Igbo | — |
| Onyinye | Gift | 👧 Girl | Igbo | — |
| Onyinyechi | God's gift | 👧 Girl | Igbo | — |