Surname الثلاثي (الثلاثي 
) , in the world, is a rare last name. The family name الثلاثي is characteristic of Yemen, where it is quite a rare surname, Saudi Arabia, where it is a rare surname, and Egypt. Likewise, الثلاثي is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| الثلاثي | Saudi Arabia, Yemen, Libya, Egypt, Iraq |