Last name كلثم (كلثم 
) , in the entire world, is a rare cognomen. The last name كلثم is habitual in Western Asia, particularly Jordan, where it is a rare surname, and Saudi Arabia. More prevalently, كلثم is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| كلثم | Jordan, Saudi Arabia, United Arab Emirates, Iraq, Oman |