Surname Thanomjan (Thanomjan 
) , all around the world, is an extremely rare cognomen. The family name Thanomjan is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More frequently, Thanomjan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thanomjan | Thailand |
Claynasoot, Buttavong, and Kuenooy