Surname รัตนากาญจน์ (Rattanakan 
, Rattanakarn , รัตนากาญจน์ ) , all around the world, is a rare last name. The surname รัตนากาญจน์ is characteristic of South-eastern Asia, particularly Thailand, where it is quite a rare surname. Very seldom, รัตนากาญจน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| รัตนากาญจน์, Rattanakan, Rattanakarn, Ruttanakan | Thailand |
Radhathanakarn, Radtanagan, Rattanagarn, Ratthanakan, Ratthanakarn, and Ruttanakarn