Cognomen ธิยัน (Thiyan 
, ธิยัน ) , throughout the world, is a rare family name. The last name ธิยัน is characteristic of Thailand, where it is a very rare surname, Indonesia, and India, where it is an extremely rare surname. Likewise, ธิยัน is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thiyan | United Kingdom, India, Myanmar, Thailand, Indonesia |
| ธิยัน | Thailand |