| Name | # Entries |
|---|---|
| Sharpe | 139 |
| Sneddon | 436 |
| Scalabrini | 1 |
| Scalabrinian | 1 |
| Scale | 37 |
| Scaliery | 1 |
| Scalise | 43 |
| Seabrooke | 7 |
| Seaby | 29 |
| Seach## | 89 |
| Seade | 0 |
| Siventhirakumar | 0 |
| Sivalingam | 24 |
| Sivaloganathan | 4 |
| Sivanathan | 23 |
| Sivapalasundram | 2 |
| Sivaprakasam | 3 |
| Sivaram | 3 |
| Sivaraman | 16 |
| Sivarasa | 8 |
| Sivas | 0 |
| Sivasothy | 2 |
| Sivasubramaniam | 25 |
| Siveyer | 1 |
| Sivathevan | 0 |
| Sivcev | 3 |
| Siveira | 1 |
| Sivies | 3 |
| Sivilay | 1 |
| Siviter | 8 |
| Suminda | 1 |
| Sumitomo | 5 |
| Summakwan | 0 |
| Summarsell | 0 |
| Summer | 47 |
| Summerbell | 9 |
| Summerhayes | 98 |
| Saint Jean | 0 |
| Sainz | 1 |
| Saira | 0 |
| Sais | 6 |
| Saisanid | 1 |
| Saith | 0 |
| Saisal | 1 |
| Saito Abdullahi | 0 |
| Saita | 1 |
| Saiz | 4 |
| Sajac Stojanovic | 0 |
| Sajan | 2 |
| Strainge | 2 |
| Straiton | 20 |
| Straley | 1 |
| Stramare | 10 |
| Strambio | 3 |
| Stranaghan | 5 |
| Snee | 0 |
| Sneed | 3 |
| Snel | 25 |
| Sneeder | 0 |
| Sneler | 2 |
| Snelgar | 26 |
| Scalon | 4 |
| Scalter | 1 |
| Seago | 7 |
| Seaghdha | 1 |
| Seagrim | 18 |
| Seaha | 2 |
| Seaib | 1 |
| Seakins | 8 |
| Swensson | 15 |
| Swettenham | 4 |
| Swiac | 2 |
| Swiadkowski | 1 |
| Swiatkiwsky | 4 |
| Swepston | 0 |