| Ruviru | A name meaning a bright star. |
| Ruwith | A name meaning wise and calm. |
| Ruxin | Chinese name meaning 'jade forest' |
| Ryane | A name meaning little king. |
| Ryanna | A graceful and royal queen. |
| Ryatt | English surname meaning 'red one' or 'fiery' |
| Ryelan | Combination of Ryan and Ellen, meaning 'little noble one' |
| Ryjder | Rider, knight, mounted warrior |
| Ryken | Scandinavian name meaning 'strong and powerful' |
| Radar | A system for detecting objects. |
| Raddix | A name meaning root or foundation. |
| Radix | Latin word meaning root or source. |
| Raigad | A royal fort in Maharashtra, India. |
| Raiv | A name meaning wealth or prosperity. |
| Rajgir | The royal house of ancient kings. |
| Rakhshak | One who acts as a protector. |
| Raks | A short form meaning protection. |
| Rakshun | A protector or guardian figure. |
| Ramesses | Born of the god Ra, the sun. |
| Rameswaram | Lord of Rama, a sacred place. |
| Ramman | The roaring god of the storm. |
| Rasalas | The honey of the mango fruit. |
| Rativar | The day of the love goddess. |
| Ratnadeva | A lord of precious jewels. |
| Raze | To level or demolish fully. |
| Razor | A sharp tool for shaving hair. |
| Redwood | A tall, giant forest tree. |
| Resheph | Ancient god of the plague. |
| Revolver | A firearm with a rotating cylinder. |
| Reyul | A name meaning king or royal ruler. |
| Rhysand | A name meaning enthusiastic spirit. |
| Rhytham | A steady, recurring musical beat. |
| Riddhim | A name meaning great prosperity. |
| Riff | A short, repeated musical phrase. |
| Rift | A crack, split, or break in ground. |
| Riga | A name meaning a ridge or a valley. |
| Rishya | A Sanskrit name meaning a male deer or antelope. |
| Robigus | The Roman god who protected crops from disease. |
| Rove | An English word meaning to wander or roam free. |
| Rubeus | Derived from the color red. |