Last name มรดก (Heritage 
, มรดก 
, Herritage 
) , all over the world, is quite a rare surname. The cognomen มรดก is habitual in Fiji, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom. Not in comparison with a country's population, it most frequently occurs in the United Kingdom, the United States, and Australia. Much less frequently, มรดก is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Heritage | United Kingdom, Australia, United States, Ghana, Nigeria |
| มรดก, Moradok | Thailand |
| Herritage | United Kingdom, Brazil, United States, South Africa, Nigeria |