Family name إكس (X. 
, إكس 
) , in the entire world, is quite a rare cognomen. The surname إكس is characteristic of Egypt, where it is a rare surname, Sudan, and Taiwan. Not in comparison with a country's population, this name is the most popular in China, Egypt, and Sudan. More prevalently, إكس is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| X. | Japan, China, Belgium, Spain, Taiwan |
| إكس | Saudi Arabia, Sudan, Morocco, Egypt, Libya |