Cognomen Lamthong (Lamthong 
) , in the world, is a rare last name. The last name Lamthong is characteristic of Thailand, where it is a rare surname, the United Kingdom, where it is an extremely rare surname, and the United States. More prevalently, Lamthong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lamthong | United Kingdom, Laos, United States, Thailand, India |