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Cognomen Rathai (ฤทัย , Rathai
) , throughout the world, is a rare surname. The family name Rathai is habitual in Singapore, where it is a rare surname, Germany, and South Africa, where it is a very rare surname. In absolute terms, it most frequently occurs in Germany, the United States, and South Africa. More frequently, Rathai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ฤทัย | Thailand |
| Rathai | India, United States, Sri Lanka, Thailand, Germany |