Family name Inthuwan (Inthuwan 
) , around the globe, is a rare cognomen. The cognomen Inthuwan is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, Inthuwan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Inthuwan | Thailand |
Arnon, Irada, Kitsada, and Aitsayaphon