Family name สุทธวนิช (สุทธวนิช 
) , all around the world, is an extremely rare surname. The family name สุทธวนิช is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Also, สุทธวนิช is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สุทธวนิช | Thailand |