Family name สุมนทา (สุมนทา 
) , across the world, is a rare last name. The surname สุมนทา is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. More frequently, สุมนทา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สุมนทา | Thailand |