Family name ธัม (Tham 
, ธัม 
) , all around the world, is a common surname. The last name ธัม is habitual in Singapore, where it is a common surname, Malaysia, where it is quite a common surname, and Macao (explore the name in all countries). Measured by absolute frequency, it is commonest in South-eastern Asia, particularly Malaysia, Singapore, and Vietnam. Also, ธัม is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tham | Taiwan, Vietnam, Singapore, Indonesia, Malaysia |
| ธัม | Thailand |