Last name مثني (مثني 
) , around the world, is quite a common family name. The family name مثني is habitual in Western Asia, particularly Yemen, where it is quite a common surname, Saudi Arabia, where it is a rare surname, and Iraq. Measured by absolute frequency, it is the most numerous in Yemen, Saudi Arabia, and Iran. Much less frequently, مثني is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| مثني | Palestinian Territory, Sudan, Saudi Arabia, Iraq, Yemen |