| 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 |