| Name | Meaning | Gender | Origin |
|---|
| Puddles | | Unisex | Hebrew |
| Pumpkin | Large round fruit with orange skin | Unisex | English |
| Quinton | Fifth | Male | Latin |
| Rags | | Unisex | Hebrew |
| Rascal | One that is playfully mischievous | Unisex | English |
| Reese | Enthusiasm | Male | Welsh |
| Riley | Rye clearing | Male | English |
| Rocket | To move swiftly and powerfully | Unisex | English |
| Rocko | | Unisex | Hebrew |
| Rocky | Battle cry | Male | Germanic |
| Roger | Famous spear | Male | English |
| Rogue | | Unisex | Hebrew |
| Roy | Red | Male | Gaelic |
| Rudy | Famous wolf | Male | Germanic |
| Rufus | Red | Male | Latin |
| Rusty | Rusty, full of rust | Unisex | American English |
| Ryan | Little King | Male | Gaelic |
| Sabre | | Unisex | Hebrew |
| Sam | He is called god | Male | Hebrew |
| Sammy | His name is God | Unisex | Hebrew |
| Samson | Sun | Male | Hebrew |
| Sandy | Defending men | Male | Greek |
| Sarge | Noncommissioned Army or Air Force rank | Unisex | English |
| Sasha | Defending men | Unisex | Greek |
| Sassy | Lively and spirited | Unisex | English |
| Scooter | One who goes suddenly and speedily. | Unisex | English |
| Scout | Observer | Unisex | American English |
| Shadow | Shadow | Unisex | English |
| Shaggy | Bushy and matted (hair), unkempt. | Unisex | English |
| Shakespeare | Brandish spear | Unisex | English |