| Spartacus | from the city of Sparta | Male | Latin |
| Spencer | Shopkeeper, dispenser, keeper | Male | English |
| Spike | A long, thick sharp-pointed piece of wood or metal | Male | American |
| Stallone | | Unisex | Hebrew |
| Stuart | Bailiff
| Male | Scottish |
| Sultan | A ruler of a Moslem country | Male | Swahili |
| Sumo | Form of wrestling. | Unisex | |
| Sundance | | Unisex | Hebrew |
| Tai | great extreme | Male | Chinese |
| Talon | large claw of a bird of prey | Male | |
| Tango | | Male | |
| Tank | A large metal container. A heavily armed combat vehicle | Unisex | |
| Taz | | Male | |
| T-Bone | A thick steak containing a T shaped bone. | Unisex | |
| Terror | | Unisex | Hebrew |
| Texas | | Male | |
| Thor | Viking mythology: the ruler of the weather | Male | Norse |
| Thunder | Sound produced from lightning | Unisex | |
| Thunder | Sound produced from lightning | Unisex | |
| Thunder | Sound produced from lightning | Unisex | |
| Tiberius | of the Tiber | Male | Latin |
| Titan | | Male | |
| Tito | Latin, meaning unknown | Male | Spanish |
| Titus | of the giants | Male | Latin |
| Triton | after Neptune's moon | Unisex | |