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