Cognomen Thayanan (Thayanan 
) , in the world, is a very rare family name. The last name Thayanan is habitual in Thailand, where it is an extremely rare surname, China, and the United States. More frequently, Thayanan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thayanan | China, United States, Thailand, Canada, Brazil |