Surname ดอกคำใต้ (Khamtai 
, Darakham , ดอกคำใต้) , worldwide, is a rare cognomen. The last name ดอกคำใต้ is characteristic of Thailand, where it is a rare surname, the United States, where it is an extremely rare surname, and India. Likewise, ดอกคำใต้ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khamtai | India, Laos, United States, Thailand |
| Darakham | India, United States, Thailand |
| Dokhomtai | Thailand |
Dokkamtai, Dokkhamtai, Dokmaipeng, and Dokmaiphum