Cognomen Khoomsap (Khoomsap 
) , around the globe, is a rare last name. The cognomen Khoomsap is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, Khoomsap is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khoomsap | Thailand |
Natcha, Chutarat, Kitprayoon, Preechaya, and Theeraphon