- Smith (continued)
- Smoot
- Smylie
- Smyth
- Smythe
- Snapp
- Snell
- Snide
- Snider
- Snodgrass
- Snow
- Snyder
- Solis
- Sollie
- Solomon
- Solson
- Solstad
- Somerby
- Somerville
- Somes
- Sooy
- Soper
- Sorensen
- Sorenson
- Sotelo
- Soule
- Southard
- Southgate
- Southwell
- Southwick
- Southworth
- Sovik
- Sowell
- Sowles
- Soyk
- Spach
- Spaeth
- Spalding
- Spaman
- Spane
- Spargo
- Sparing
- Sparks
- Sparling
- Sparrow
- Spatz
- Spaulding
- Spear
- Speed
- Speers
- Speidel
- Spence
- Spencer