| Name | Meaning | Gender | Origin |
|---|
| Olinda | Native of Olinda | Female | Spanish |
| Orlantha | Famous Land | Female | German |
| Osbaldo | Uncertain, possibly divine power | Male | German |
| Ossi | | Unisex | Hebrew |
| Osvaldo | Uncertain, possibly divine power | Male | German |
| Oswald | Uncertain, possibly divine power | Male | German |
| Oswaldo | Uncertain, possibly divine power | Male | German |
| Othello | Wealth | Male | German |
| Otis | One who hears well | Male | Greek |
| Otto | Wealth | Male | German |
| Penrod | Famous Commander | Male | English |
| Pepin | Petitioner | Female | Germanic |
| Philomena | To love strength | Female | Greek |
| Porsche | Pig | Unisex | Latin |
| Prinz | | Unisex | Hebrew |
| Raina | Queen | Female | Latin |
| Rainer | Wise army | Male | Germanic |
| Raymond | Advice | Male | Germanic |
| Raynard | Strong Counselor. | Male | English |
| Reiko | Courteous child | Female | Japanese |
| Renate | Reborn | Unisex | Latin |
| Rex | King | Male | Latin |
| Richard | Strong power | Male | French |
| Richelle | Strong power | Female | French |
| Rita | Pearl | Female | Greek |
| Ritter | Knight | Male | German |
| Rocky | Battle cry | Male | Germanic |
| Roderica | Famous Ruler | Female | English |
| Roderick | Famous ruler | Male | Germanic |
| Roger | Famous spear | Male | English |