Family name กุศลวิทย์ (กุศลวิทย์ 
) , all over the world, is a very rare surname. The cognomen กุศลวิทย์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, กุศลวิทย์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| กุศลวิทย์ | Thailand |