Family name Hongthongdaeng (Hongthongdaeng 
) , worldwide, is a very rare last name. The cognomen Hongthongdaeng is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Hongthongdaeng | Thailand |
Riam, Pinai, Phinai, Saowaros, and Phimchamai