Family name ยิ้มวิทยา (ยิ้มวิทยา, Yimwittaya 
) , in the world, is an extremely rare cognomen. The family name ยิ้มวิทยา is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Yimwittaya | Thailand |