Last name สมาย (Samai 
, สมาย , Smey 
) , globally, is a common surname. The last name สมาย is characteristic of Sierra Leone, where it is quite a rare surname, Laos, and Trinidad and Tobago. Not in comparison with a country's population, it is commonest in India, Algeria, and Sierra Leone. Likewise, สมาย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Samai | Thailand, Sierra Leone, Laos, India, Algeria |
| สมาย | Thailand |
| Smey | Canada, Thailand, France, United States, India |