Surname กัณฐ (Kantha 
, กัณฐ ) , all over the world, is quite a common last name. The surname กัณฐ is characteristic of Sri Lanka, where it is quite a rare surname, Thailand, and Qatar. Measured by absolute frequency, it is the most numerous in India, Thailand, and Sri Lanka. Also, กัณฐ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kantha | South Africa, Sri Lanka, Thailand, India, Bangladesh |
| กัณฐ | Thailand |
คงสัตย์, and อังศุสิงห์