Cognomen Siewhong (Siewhong 
) , in the world, is a very rare surname. The surname Siewhong is habitual in South-eastern Asia, particularly Singapore, where it is a rare surname, and Malaysia, where it is a very rare surname. More frequently, Siewhong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siewhong | Singapore, Malaysia, Australia, United States, Thailand |