Cognomen กัณฐา (Kantha 
, กัณฐา ) , in the world, is quite a common family name. The last name กัณฐา is characteristic of Sri Lanka, where it is quite a rare surname, Thailand, and Qatar. Not in comparison with a country's population, it is commonest in India, Thailand, and Sri Lanka. Likewise, กัณฐา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kantha | Bangladesh, South Africa, Thailand, India, Sri Lanka |
| กัณฐา | Thailand |