- Southmayd (continued)
- Southwell
- Southwick
- Southworth
- Sovik
- Sowell
- Sowles
- Soyk
- Spach
- Spaeth
- Spalding
- Spaman
- Spane
- Spargo
- Sparing
- Sparks
- Sparling
- Sparrow
- Spatz
- Spaulding
- Spear
- Speed
- Speers
- Speidel
- Speir
- Spelman
- Spence
- Spencer
- Spencer-Churchill
- Spenser
- Sperling
- Sperry
- Spicer
- Spiegel
- Spindler
- Spink
- Spinney
- Spinnings
- Spira
- Spittler
- Spivey
- Splaine
- Spofford
- Spooner
- Spotwood
- Sprague