In all the world, รัตนสิน (Ratanasin 
, รัตนสิน , Ratthasin ) is a rare predominantly male, but very seldom feminine forename. The first name รัตนสิน is habitual in Thailand, where it is a very rare epicene name, and India, where it is a very rare masculine name. Also, รัตนสิน is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Ratanasin | Malaysia, India, United States, Thailand |
| รัตนสิน, Ratthasin | Thailand |
| Ratnsin | India |
Ratanasint, Rattanasin, Rattanasint, Rattnasin, and Ruttanasin
| ดิเรกสิน รัตนสิน (b. 1985) |
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