At least one of them needs to be named Dudley.
Huh, I somehow missed the “S” requirement.
Fine, SIR Dudley. 
I’d name the middle one Saddam, but I’m too old to enter.
Spooky
SCHUUUUUUUULTZ!!1!
I notice you didn’t mention Shirley…
shirley! :smack:
Except it isn’t the kind of name that would strike fear in the heart of a fleeing villian, would it.
sic him, Shirley!
Boy names:
Samson
Steel
Sandy
Swift
Girl Names:
Shula
Sorcha (surk-ha)
Sile (Shee-la)
Siobhán
Sinéad
My favourite is “Saoirse” (seer-sha), which comes from the Irish word meaning freedom or liberty, it’s mostly a girl’s name but could be either.
A friend of mine once named a kitten Smarmy. (And his brother Repugnant.) Smarmy the Mountie Dog. I like it.
Excellent! 
Wow! Super cute puppies!
Salty
Steak
Spinach
Spam
Salad
Sandwich
Sugar
Shake
Shrimp
Salsa
Sébastien, Serge, Sylvie, Stéphane, Simone, Solange, Suzanne, Sylvain, Sinjon, and Soleil.
Spooje
Steamé
Stoolie