Family name พันธุ์ไทย (Thai 
, พันธุ์ไทย 
, Phanthai 
) , across the world, is a common cognomen. The cognomen พันธุ์ไทย is characteristic of Malaysia, where it is quite a common surname, Lesotho, and Bhutan (explore the name in all countries). Not in comparison with a country's population, it is commonest in Malaysia, Vietnam, and the United States. Also, พันธุ์ไทย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thai | Malaysia, Myanmar, Australia, United States, Vietnam |
| พันธุ์ไทย | Thailand |
| Phanthai | Canada, Laos, United States, Thailand |