Family name ทรงกลม (Sphere 
, ทรงกลม 
, Sonklom) , throughout the world, is a rare last name. The surname ทรงกลม is characteristic of South Africa, where it is a rare surname, France, where it is a very rare surname, and Indonesia. Very seldom, ทรงกลม is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sphere | United States, South Africa, India, France, Indonesia |
| ทรงกลม | Thailand |