| Surname | Approximate Number | % Frequency | Rank |
|---|---|---|---|
| XAIMOUNGKHOUN | 0 | n/a | 59025 |
| XANDER | 0 | n/a | 75971 |
| XANG | 0 | n/a | 30869 |
| XAVIER | 0.001 | 2,487 | 12285 |
| XAYASITH | 0 | n/a | 66378 |
| XAYAVONG | 0 | n/a | 53320 |
| XIA | 0 | n/a | 34382 |
| XIANG | 0 | n/a | 36462 |
| XIAO | 0 | n/a | 26915 |
| XIE | 0.001 | 2,487 | 17912 |
| XIMENEZ | 0 | n/a | 41581 |
| XIMINES | 0 | n/a | 59024 |
| XIONG | 0.007 | 17,409 | 1731 |
| XU | 0.001 | 2,487 | 10540 |
| XUE | 0 | n/a | 48597 |
| XYONG | 0 | n/a | 66377 |