Surname ธนรัตนวิโรจน์ (ธนรัตนวิโรจน์ 
) , throughout the world, is an extremely rare family name. The surname ธนรัตนวิโรจน์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| ธนรัตนวิโรจน์ | Thailand |