Surname กระทุ่มนอก (กระทุ่มนอก, Krudnok 
) , across the world, is an extremely rare family name. The family name กระทุ่มนอก is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Krudnok | Thailand |