Cognomen มาฤทธิ์ (Marit 
, มาฤทธิ์ 
) , globally, is quite a rare family name. The family name มาฤทธิ์ is habitual in Norway, where it is quite a rare surname, Belgium, and Thailand, where it is a rare surname. Not in comparison with a country's population, it is commonest in Thailand, France, and Ethiopia. More prevalently, มาฤทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Marit | Norway, Germany, Netherlands, United States, Sweden |
| มาฤทธิ์ | Thailand |