Surname กรรณสูตร (กรรณสูตร 
, Kannasut 
, Karnasut ) , all around the world, is a rare cognomen. The last name กรรณสูตร is habitual in Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Much less frequently, กรรณสูตร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| กรรณสูตร | Thailand |
| Kannasut, Karnasut | Thailand, United States |