Surname พจน์ศิริ (พจน์ศิริ 
) , around the world, is a very rare family name. The last name พจน์ศิริ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, พจน์ศิริ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| พจน์ศิริ | Thailand |