Cognomen กตัญญญสูตร (กตัญญญสูตร 
) , throughout the world, is an extremely rare last name. The family name กตัญญญสูตร is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| กตัญญญสูตร | Thailand |