Family name Siew Yong (Siew Yong 
) , worldwide, is a rare cognomen. The surname Siew Yong is habitual in South-eastern Asia, particularly Malaysia, where it is a rare surname, and Singapore. More prevalently, Siew Yong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siew Yong | Malaysia, Singapore, Canada, Australia |