| Name | Meaning | Gender | Origin |
|---|
| Neptune | God of the sea | Unisex | Latin |
| Oscar | Divine spear | Male | English |
| Pax | Peace | Unisex | Latin |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | English |
| Pluto | Wealth, riches | Unisex | Greek |
| Red | Red | Unisex | English |
| Riley | Rye clearing | Male | English |
| Rocky | Battle cry | Male | Germanic |
| Rudy | Famous wolf | Male | Germanic |
| Rufus | Red | Male | Latin |
| Rusty | Rusty, full of rust | Unisex | American English |
| 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 |
| Sasha | Defending men | Unisex | Greek |
| Sassy | Lively and spirited | Unisex | English |
| Scout | Observer | Unisex | American English |
| Shadow | Shadow | Unisex | English |
| Shamrock | | Unisex | Hebrew |
| Smith | A smith | Male | English |
| Smoky | | Unisex | Hebrew |
| Sparky | Animated, lively. | Unisex | English |
| Spike | A long, thick sharp-pointed piece of wood or metal | Male | English |
| Spirit | Part of the human being associated with the mind. Vigorous or animated state - spirited. Also distilled alcohol. | Unisex | English |
| Splash | To cause fluid to scatter in flying masses. To display very noticeably. | Unisex | English |
| Teddy | Gift of God | Male | Greek |
| Timber | Wood used as a building material. Also timber-wolf. | Unisex | English |
| Toby | God is good | Unisex | Hebrew |