Last name ธัญญสิริโรจน์ (ธัญญสิริโรจน์ 
) , all around the world, is a very rare cognomen. The surname ธัญญสิริโรจน์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ธัญญสิริโรจน์ | Thailand |