Cognomen ทองคํา (ทองคํา 
, Tongkham 
, Tongkam 
) , throughout the world, is a common surname. The family name ทองคํา is characteristic of Thailand, where it is quite a common surname, and Nigeria, where it is a very rare surname. Likewise, ทองคํา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ทองคํา | Thailand |
| Tongkham | Laos, India, Thailand, United States |
| Tongkam | Nigeria, Germany, Thailand, United States, India |
Tathongkam, Thonghtain, Thongkamka, Thongkham, Thongkhom, Thongkhoun, Thongklam, Thongkord, Thongkumpa, Tonginkhai, Tongkhammak, Tongkhom, and Tongkhum