Surname รัตนนคร (รัตนนคร 
, Ratnakhon, Ratanakhon) , all over the world, is a very rare cognomen. The family name รัตนนคร is characteristic of Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, รัตนนคร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| รัตนนคร | Thailand |
| Ratananakorn | United States, Thailand |