- Smith (continued)
- Smoko
- Smoot
- Smylie
- Smyth
- Smythe
- Snapp
- Snell
- Snide
- Snider
- Snodgrass
- Snover
- Snow
- Snyder
- Solis
- Sollie
- Solomon
- Solson
- Solstad
- Somerby
- Somers
- Somerville
- Somes
- Somner
- Sooy
- Soper
- Sorensen
- Sorenson
- Sorrell
- Sorrells
- Sotelo
- Soule
- Soulton
- Southard
- Southcott
- Southerland
- Southgate
- Southmayd
- Southwell
- Southwick
- Southworth
- Sovik
- Sowell
- Sowles
- Soyk
- Spach
- Spaeth
- Spalding
- Spaman
- Spane
- Spargo
- Sparing
- Sparks