| Sada | 343 |
| Sah-kwi-ah-ki | 459 |
| Salamoun | 323 |
| Samples | 8 |
| Samuels | 55 |
| Sand | 218 333 |
| Sandaine | 83 |
| Sandbo | 152 276 361 362 382 498 |
| Sandford | 373 |
| Sandstrom | 30 87 9 99 193 202 212 215 224 252 253 257 258 260 261 264 274 280 296 357 358 381 382 384 392 411 436 437 438 476 |
| Sargant | 100 |
| Sargent | 68 69 71 77 79 84 126 |
| Sarjeant | 23 286 332 362 363 364 |
| Satterfield | 2 84 85 104 105 110 153 154 181 224 241 292 301 346 347 359 376 382 384 429 442 502 |
| Saunders | 153 |
| Sayers | 159 240 |
| Scanlon | 42 |
| Schaeffer | 88 308 381 |
| Scharpp | 376 |
| Scheider | 425 |
| Scherzer | 193 |
| Schife | 381 |
| Schlecter | 229 |
| Schlector | 381 |
| Schmidt | 168 174 |
| Schmitz | 293 |
| Schnider | 477 |
| Schoenberger | 381 384 507 513 |
| Schoeneche | 408 411 415 |
| Schoenover | 381 384 |
| Schrank | 364 |
| Schreier | 67 92 96 |
| Schuller | 99 |
| Schultz | 7 141 225 283 323 381 459 504 508 509 |
| Schulze | 247 248 293 304 384 418 |
| Schumacher | 496 |
| Schumaker | 277 |
| Schwag | 449 |
| Schwarble | 247 |
| Schwenke | 452 |
| Schyer | 263 |
| Scibness | 432 |
| Scott | 79 211 223 332 381 384 454 |
| Scyphers | 136 |
| Searles | 37 450 |
| Sears | 241 |
| Sebek | 131 |
| Sederholm | 293 |
| Seidel | 276 309 498 |
| Seidensticker | 293 |
| Seilstad | 179 293 |
| Selchert | 72 |
| Seller | 60 |
| Selvige | 67 |
| Semour | 247 |
| Senef | 293 |
| Seover | 293 |
| Severson | 201 327 |
| Seyller | 288 369 |
| Shanklin | 92 93 254 |
| Shannon | 293 |
| Sharp | 311 |
| Sharpe | 187 |
| Sharpstein | 300 301 |
| Shatzer | 396 |
| Shaw | 39 240 414 |
| Shebesta | 215 |
| Sheldon | 395 |
| Shellito | 447 |
| Sherman | 34 153 192 193 212 300 312 313 314 383 478 486 487 |
| Shields | 467 481 513 |
| Shierson | 293 |
| Shipe | 388 |
| Shipp | 513 |
| Shipton | 188 |
| Shirey | 299 331 513 |
| Shmitt | 454 |
| Shoemaker | 381 496 |
| Shortridge | 85 |
| Shoup | 382 |
| Shufelt | 463 |
| Siems | 507 |
| Sikveland | 407 408 |
| Simensen | 272 273 |
| Simkin | 382 |
| Simkins | 353 364 365 382 496 |
| Simmons | 202 241 |
| Simofy | 65 |
| Simon | 302 |
| Simpkins | 42 |
| Simpson | 293 |
| Sims | 137 |
| Sinclair | 22 99 193 381 399 405 406 412 |
| Siroky | 31 42 114 137 172 181 251 276 283 284 285 291 293 299 304 307 312 317 318 326 366 367 368 369 377 382 395 439 449 487 506 513 |
| Sirucek | 114 116 124 125 126 129 137 138 283 |
| Sjaarde | 413 |
| Skalka | 124 130 138 283 381 |
| Skibbey | 452 |
| Skibness | 252 271 |
| Skinner | 305 360 |
| Skjelstad | 324 |
| Slaby | 137 369 513 |
| Slade | 340 |
| Sleasman | 444 |
| Slive | 402 |
| Sluggett | 7 27 42 154 401 501 513 |
| Smart | 155 161 |
| Smetana | 447 |
| Smith | 23 30 33 65 75 93 99 113 153 158 178 191 241 281 290 293 299 311 368 369 382 384 419 451 453 468 488 496 497 503 513 |
| Smythe | 495 |
| Sneath | 423 |
| Snooks | 18 19 382 |
| Snyder | 148 168 |
| Solberg | 76 |
| Solf | 368 |
| Solleder | 413 |
| Sommers | 237 |
| Sordahl | 241 |
| Sorenson | 91 |
| Sotile | 513 |
| Souchek | 42 367 369 381 384 |
| Southworth | 41 144 183 233 235 240 241 242 243 408 415 508 509 |
| Soverign | 239 |
| Spackman (Speckman) | 413 |
| Spakeman | 381 |
| Sparling | 293 |
| Spaulding | 381 384 |
| Spears | 412 |
| Spellman | 152 |
| Spencer | 102 |
| Sper | 377 |
| Spicer | 217 |
| Spicker | 460 |
| Spika | 381 |
| Spiker | 252 257 258 259 270 437 |
| Spinner | 215 226 |
| Spiroff | 41 230 244 291 381 382 404 426 |
| Spoon | 107 110 248 400 442 |
| Spranger | 293 |
| Sprigston | 481 |
| Springer | 108 |
| Sprinkle | 293 |
| Spurgeon | 58 |
| Squire | 178 293 |
| Sramek | 249 250 279 |
| St. John | 402 |
| Stabb | 73 381 |
| Stack | 429 432 |
| Staff | 388 |
| Stanley | 36 139 |
| Stanton | 381 |
| Staples | 377 |
| Stapleton | 293 |
| Steab | 382 |
| Stebbin | 107 109 |
| Stecher | 513 |
| Steeb | 232 |
| Steele | 154 397 |
| Steen | 350 |
| Steidley | 25 509 |
| Steinbring | 163 181 |
| Steinfadt | 417 418 427 428 |
| Steinfalt | 381 |
| Steinfeldt | 372 |
| Stendal | 30 102 105 123 245 266 276 281 369 370 380 471 491 |
| Stenson | 73 293 |
| Stepan | 42 182 281 283 376 381 486 497 513 |
| Stephens | 7 9 23 32 33 52 61 69 81 84 88 89 114 143 159 171 178 183 186 224 286 288 291 293 298 300 301 302 338 361 369 378 381 382 389 391 392 400 402 409 413 417 425 435 |
| Stereson | 293 |
| Stetson | 293 |
| Stevens | 151 153 163 230 247 299 370 371 498 |
| Stewart | 33 202 293 |
| Stibal | 42 381 382 384 497 498 |
| Stice | 285 293 |
| Stiedly | 194 |
| Stiendorf | 279 |
| Stiff | 127 |
| Stiles | 91 |
| Stilson | 132 |
| Stimpson | 293 |
| Stipek | 213 |
| Stockton | 293 |
| Stoddard | 104 |
| Stoetzel | 293 |
| Stoffield | 325 |
| Stofield | 80 |
| Storkson | 384 |
| Story | 151 328 513 |
| Stoudt | 322 |
| Stowell | 47 |
| Straight | 85 |
| Strain | 173 |
| Strait | 105 109 |
| Stransky | 310 |
| Stratton | 76 |
| Strausburg | 30 62 63 70 163 173 186 241 320 382 495 |
| Strever | 51 |
| Stricklett | 262 |
| Stroble | 271 272 293 |
| Strommen | 293 |
| Stromms | 293 |
| Stroops | 511 |
| Strope | 447 |
| Strouf | 249 |
| Strunk | 293 382 504 513 |
| Stuart | 7 51 52 61 62 188 189 190 283 430 448 513 |
| Stubbin | 104 105 111 |
| Stueben | 299 |
| Stulc | 147 |
| Stumpf | 182 |
| Sturdy | 53 74 176 287 347 371 |
| Styer | 26 144 153 154 230 244 292 401 484 486 490 503 513 |
| Suchan | 139 |
| Suchanova | 328 |
| Sullinger | 392 413 414 |
| Sullivan | 49 168 248 |
| Summers | 381 394 |
| Sundance Kid | 441 |
| Sunell | 293 |
| Sunsted | 293 |
| Surdarth | 465 |
| Sutton | 359 |
| Swaddy | 402 |
| Swan | 293 333 |
| Swanke | 478 |
| Swanson | 88 381 |
| Swanz | 293 |
| Swarble | 246 |
| Swears | 153 |
| Sweenery | 452 |
| Sweeney | 293 |
| Sweeting | 245 502 |
| Sweitzer | 94 |
| Swensen | 160 |
| Swift | 46 |
| Swoboda | 116 121 128 131 247 251 325 381 382 383 |
| Syfert | 360 |
| Syron | 72 371 372 382 |
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