Surname ทันใด (Thandai 
, ทันใด , Oonwises ) , in the world, is a very rare cognomen. The surname ทันใด is habitual in Thailand, where it is a very rare surname, and India, where it is an extremely rare surname. Likewise, ทันใด is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thandai | India, South Africa, Thailand |
| ทันใด, Oonwises | Thailand |