Family name ธวัชศิริโรจน์ (ธวัชศิริโรจน์ 
) , all around the world, is an extremely rare cognomen. The cognomen ธวัชศิริโรจน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ธวัชศิริโรจน์ | Thailand |