Surname Yothathammasit (Yothathammasit 
) , across the world, is a very rare family name. The cognomen Yothathammasit is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Yothathammasit | Thailand |
Pimkarn, Chanyapat, and Lapassanan