Surname รัตนกาญจน์ (รัตนกาญจน์ 
, Rattanakarn , Ratanakan 
) , around the globe, is a rare family name. The last name รัตนกาญจน์ is habitual in South-eastern Asia, particularly Thailand, where it is quite a rare surname. Also, รัตนกาญจน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rattanakarn, รัตนกาญจน์ | Thailand |
| Ratanakan | United States, India, Thailand |