Surname รัตนโกสินทร์ (รัตนโกสินทร์ 
, Rattanakosin , Ratthagon ) , worldwide, is a rare cognomen. The last name รัตนโกสินทร์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Also, รัตนโกสินทร์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rattanakosin, รัตนโกสินทร์, Ratthagon, Rattanagosin | Thailand |
Ratanagrowson, Ratanakosin, Rattanakalo, Rattanakao, Rattanakosain, Rattanakuot, Rattanankot, and Rattannakosin