Family name ธีรวัฒนศักดิ์ (ธีรวัฒนศักดิ์ 
, Tirawatanasak, Thirawatthanasak ) , all around the world, is a very rare cognomen. The family name ธีรวัฒนศักดิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, ธีรวัฒนศักดิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thirawatthanasak, ธีรวัฒนศักดิ์, Theerawattanasak | Thailand |