Cognomen เหล็กแพงวงษ์ (เหล็กแพงวงษ์ 
) , in the entire world, is an extremely rare surname. The cognomen เหล็กแพงวงษ์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| เหล็กแพงวงษ์ | Thailand |