Last name Thongdang (Thongdang 
) , around the world, is a rare cognomen. The family name Thongdang is habitual in Thailand, where it is quite a rare surname, Australia, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Much less frequently, Thongdang is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thongdang | Australia, Thailand, United States, Malaysia |