Family name เทศกุล (Sermon 
, เทศกุล 
) , in all the world, is quite a rare surname. The cognomen เทศกุล is habitual in Belgium, where it is quite a rare surname, Philippines, where it is a rare surname, and Australia. Measured by absolute frequency, the name is most common in Philippines, the United States, and Belgium. Very seldom, เทศกุล is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sermon | Philippines, United States, United Kingdom, Belgium, Democratic Republic of the Congo |
| เทศกุล | Thailand |