Family name Thanatdanai (Thanatdanai 
) , across the world, is a very rare surname. The cognomen Thanatdanai is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. Likewise, Thanatdanai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thanatdanai | Thailand, China |