| Kaaro | 153 155 163 168 169 170 171 173 177 179 180 186 187 255 276 320 381 382 500 |
| Kadlec | 131 |
| Kahler | 171 172 282 331 332 333 507 |
| Kaimiloff | 416 |
| Kaiser | 79 442 |
| Kakela | 388 |
| Kalal | 41 103 114 117 165 167 251 276 281 288 290 301 302 303 321 328 330 331 356 370 372 381 382 384 391 426 484 485 513 |
| Kalash | 139 |
| Kalina | 31 116 121 122 123 124 126 129 131 135 141 143 145 161 177 235 245 251 279 285 292 318 363 382 384 395 426 433 513 |
| Kananen | 75 278 382 503 504 513 |
| Karau | 291 303 304 308 486 |
| Karhi | 293 |
| Kasala | 42 117 120 124 129 138 381 |
| Kaschke | 511 |
| Kaslelitz | 502 |
| Kaufman | 293 |
| Kauth | 41 222 231 232 339 351 378 381 418 420 421 422 425 427 437 488 |
| Kearney | 92 |
| Keefer | 384 504 513 |
| Kees | 143 |
| Keith | 304 |
| Kelker | 22 201 |
| Keller | 2 48 66 176 486 511 513 |
| Kellner | 59 114 117 125 136 278 281 |
| Kellogg | 30 |
| Kelly | 5 47 94 114 292 293 |
| Kendall | 30 457 458 461 |
| Kennedy | 125 186 187 348 |
| Kennett | 78 114 |
| Keppel | 458 459 |
| Kerns | 406 |
| Kerr | 381 |
| Khronek | 163 |
| Kibbee | 331 |
| Kibler | 478 |
| Kid Curry | 192 |
| Kiefer | 414 |
| Kier | 274 |
| Kies | 4 187 |
| Killebrew | 293 |
| Killham | 153 505 |
| Kilmer | 288 349 |
| Kilpatrick | 92 193 296 297 392 478 486 |
| Kindle | 382 505 506 |
| Kindred | 163 |
| King | 37 38 66 71 76 77 168 169 228 279 381 442 459 |
| Kinsella | 114 407 |
| Kipp | 5 153 275 459 |
| Kirk | 185 |
| Kirkendall | 108 |
| Kirkpatrick | 114 |
| Kirstein | 244 |
| Kiska | 244 400 410 |
| Kistler | 347 |
| Kleifgen | 381 430 431 |
| Klein | 293 |
| Kleiner | 135 |
| Kliegel | 340 |
| Klopp | 92 |
| Knapp | 129 |
| Knapton | 56 335 382 |
| Knerr | 154 404 505 507 513 |
| Knierin | 293 |
| Knight | 91 293 308 388 425 |
| Knoblock | 457 |
| Knode | 511 |
| Knouse | 320 331 505 509 |
| Know | 68 69 107 245 |
| Knox | 448 460 |
| Knutson | 172 175 177 179 |
| Kochheiser | 203 205 206 |
| Kodejs | 161 |
| Koelzer | 460 461 |
| Koeppe | 372 |
| Koetitz | 293 |
| Kolar | 125 126 138 287 |
| Koliha | 24 67 89 115 126 127 128 134 161 202 215 284 319 382 395 |
| Koll | 161 |
| Kolstad | 317 513 |
| Komarek | 41 87 115 153 177 194 215 219 232 274 285 292 327 358 366 368 382 383 437 439 471 478 480 481 487 488 489 493 497 501 508 509 512 513 |
| Kosir | 41 142 144 145 272 279 381 384 426 |
| Kosmata | 126 |
| Kostaryz | 114 |
| Kostoryz | 368 |
| Kouri | 289 |
| Kovacich | 194 434 |
| Koza | 131 |
| Kozeluh | 128 129 |
| Krafden | 96 265 266 |
| Kraft | 372 388 |
| Krahulek | 287 288 |
| Krahulik | 123 129 133 |
| Krall | 67 |
| Kramer | 82 |
| Kramlich | 297 298 |
| Krantz | 99 |
| Kreiger | 511 |
| Krevnik | 492 |
| Krieger | 293 |
| Krohn | 473 |
| Kronke | 92 |
| Kruger | 67 |
| Krugler | 404 |
| Kucera | 331 503 505 |
| Kudzia | 36 42 114 146 202 210 213 214 215 382 |
| Kupke | 247 |
| Kuras (Kurns) | 13 56 57 173 |
| Kurth | 194 195 |
| Kurtz | 451 500 |
| Kuykendall | 293 |
| Kviz | 117 124 129 283 284 |
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