Family name เก่งธรรมกิจ (เก่งธรรมกิจ, Kengthamakit 
) , in the world, is a very rare last name. The last name เก่งธรรมกิจ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kengthamakit | Thailand |