Surname รัตนวงศาโรจน์ (รัตนวงศาโรจน์ 
, Rattanavongsaroj , Ratanawongsaroj ) , in the entire world, is a rare last name. The last name รัตนวงศาโรจน์ is habitual in Thailand, where it is a rare surname, and China, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rattanavongsaroj, รัตนวงศาโรจน์, Ratanawongsaroj | Thailand |
| Ratanawongsarot | China, Thailand |