Cognomen สิริมธุรพจน์ (สิริมธุรพจน์ 
) , throughout the world, is a very rare family name. The cognomen สิริมธุรพจน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| สิริมธุรพจน์ | Thailand |