Cognomen Loomthaisong (Loomthaisong 
) , in all the world, is a very rare last name. The last name Loomthaisong is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Loomthaisong | Thailand |
Oramin, Siwanon, and Phakhawadee