- Smythe
- Snagge
- Snarr
- Snashall
- Snedeger
- Snelgrove
- Snell
- Snelling
- Snook
- Snooke
- Snow
- Snowden
- Snowdon
- Snyder
- Soames
- Soden
- Softley
- Soley
- Solly
- Solmes
- Solomon
- Solvay
- Solway
- Somerset
- Somerville
- Sone
- Soper
- Sopp
- Frederick E. (before 1893 - before 1939)
- Kate (1883 - circa 1977)
- Kate (1913 - )
- Sarah (between 1780 and 1790 - between 1822 and 1831)
- Sorenson
- Sorrell
- Sosbe
- Souter
- South
- Southall
- Southby
- Southcombe
- Southerden
- Southern
- Southey
- Southgate
- Southorn
- Southward
- Southwood
- Sowden
- Sowdon
- Sowdwn
- Spackman
- Spain
- Spalding
- Spangler
- Spanswick
- Spanton